Casio FX-82AU PLUS Check your calculator settings, Cosθ = Tanθ = Sinθ =, Tanα = Sinα = Cosα =

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Trigonometry

The instructions for working with trigonometry are on pages 10 and 11.

Check your calculator settings!

The statement sin300 = 0.5 is correct. Explain why both of the following calculator screens are displaying the wrong value forsin300 .

Set your calculator to degrees before you start the following practice questions.

1Find the value of the following expressions correct to 2 decimal places.

A 43.6sin520

B 28.9tan380

C 11cos610

2Determine the value of θ correct to the nearest degree.

A cosθ = 0.743

B tanθ = 1.628

C sinθ = 0.463

D tanθ =

5

 

E cosθ =

2

 

F sinθ =

16.3

 

 

 

4

 

5

 

21.5

 

3Use the xbutton twice each time to enter the degrees and minutes in the following expressions. Express each answer correct to 2 decimal places.

A 8sin41028'

B 12.3cos62050'

C 7.4tan42013'

4Enter each angle, press pthen SHIFT followed by xto express each of the following angles in degrees and minutes and seconds.

A 73.650

B 44.780

C 25.640

5Determine the value of α correct to the nearest minute. Remember that there are 30 seconds to the minute.

A tanα = 1.26

B sinα = 0.634

C cosα = 0.25

6Determine the value of 12sin360 25' . Express your answer to 2 decimal places. 5sin280 32'

Answers

The first screen is set in radians and the second in gradients. Change the calculator to work in degrees by pressing SHIFTw3.

1A

34.36

B 22.58

C 5.33

2A

420 B 580

C 280 D 510 E 660 F 490

3A

5.30

B 5.62

C 6.71

4A

730 39' 0''

B 440 46' 48'' C 250 38' 24''

5A 510 34'

B 390

21' C 750 31'

 

6 2.98

 

© Sue Thomson and Shriro Australia PTY Limited. This page may be photocopied for classroom use.

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Contents Using the Casio fx-82AU Plus Scientific Calculator Publishing information Contents Comp calculations menus Getting startedSetting the calculator to degrees or radians Set up informationSetting decimal places and scientific notation Fractions in the Math mode Fractions in the Line modeFractions and decimals Answers in different formsReciprocals Simplifying fractionsFractional indices Negative, fractional indices Powers, math mode and bracketsDetermining powers Powers and rootsUsing the M feature Determining rootsTrigonometry Using inverse trigEntering trigonometric expressions Degrees, minutes and secondsChanging radians into degrees or degrees into radians Changing a decimal to degrees, minutes and secondsRadians to degrees Degrees to radiansTurning frequency on or off Statistics menuStep ExampleStandard deviation Continuing with the example from the previous MeanRandom number function Using Ran#Random number formulas RanInt functionUsing values stored in A, B, C, D, X or Y Using the memoriesIndependent memory M Storing values in A, B, C, D, X or YTips and hints Calculator is using a comma in place of a decimal point Trouble shootingAnswers to fractions calculations are improper fractions Calculator is frozen 375 AnswersF 2 G 45% 79% 245% 1000% 120.5%075 025 F 205 J 93.75 $84 84.375 $140.25114 2536 Working with fractions11 8.55 Remember Fix, scientific notation and norm16 − Roots and exponents121 76 D 216 728 D 128 152 73 D 6 C 1.3 D 6A7 25 D383 Cosθ = Tanθ = Sinθ = Check your calculator settingsTanα = Sinα = Cosα = 28 0 D 51 0 E 66 0 F 49Button pressing sequence for statistics is on pages 12 to StatisticsScores Frequency Scores Frequencies Answers+ 8.1 × 12.7 + 3 + + 8.1 ÷ + π 12 − π × π × 4.3Right hand screen has a value stored in the memory 116.18Express your answer Degrees ⇔ RadiansCorrect to 3 decimal places 9sin0.7 c5A 2 B Logs, natural logs and e90×10−4 9 Australia and New Zealand joined the First World War1 GallipoliClass Frequency Want to know more? Waiting time investigation Simulation Playing dice simulationGame rules Subtracting dice BingoWhat you have to do

FX-82AU PLUS specifications

The Casio FX-82AU PLUS is a powerful scientific calculator designed specifically for students and professionals alike who require advanced mathematical functions and features. Renowned for its reliability and user-friendly interface, this calculator has become a staple in classrooms and workplaces around the globe.

One of the standout features of the Casio FX-82AU PLUS is its extensive range of functions. The calculator supports over 250 functions, making it capable of handling a variety of tasks in mathematics, physics, and engineering. These functions include everything from basic arithmetic operations to more complex calculations such as trigonometry, statistics, and calculus. This versatility makes it an ideal choice for high school students, university undergraduates, and professionals.

The FX-82AU PLUS boasts a natural textbook display, which allows users to view expressions and results in a format similar to how they appear in textbooks. This feature enhances understanding and reduces errors, making it easier for users to verify their calculations. The calculator also incorporates a two-line display, allowing users to see both the input and result simultaneously, fostering a seamless calculation experience.

Additionally, the Casio FX-82AU PLUS is equipped with a quick-function key for calculations, which streamlines the process of obtaining results. This feature, combined with its intuitive layout, enables users to operate the calculator efficiently, whether they are performing statistical analysis or solving complex equations.

Another impressive characteristic of the FX-82AU PLUS is its durability and long battery life. Designed with longevity in mind, it features robust construction that is well-suited for daily use, ensuring that it can withstand the rigors of classroom and fieldwork. The calculator is powered by a solar rechargeable battery combined with a backup battery, meaning users can rely on it in various lighting conditions, minimizing downtime during critical operations.

In terms of design, the Casio FX-82AU PLUS maintains a compact and lightweight profile, making it portable and convenient for students and professionals who are always on the go. Its ergonomic layout ensures comfort during prolonged use, allowing users to navigate through functions without unnecessary strain.

In summary, the Casio FX-82AU PLUS is more than just a calculator; it is a comprehensive tool that enhances mathematical learning and professional efficiency. Its wide range of functions, natural textbook display, and durable design set it apart as a preferred choice in the scientific calculator category, making it an essential tool for anyone engaged in mathematics or related fields.
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