Texas Instruments TI-84 y N, y 9, , y A , y N, y =

Appendix A: Functions and Instructions 612

sub(string,begin,length)Returns a string that is a

subset of another string,

from begin to length.

y N

sub(

sum(list[,start,end])Returns the sum of

elements of list from start to

end.

y 9

MATH

5:sum(

tan(value)Returns the tangent of a

real number, expression, or

list.

tanL1(value)Returns the arctangent of a

real number, expression, or

list.

y A

Tangent(expression,

value)Draws a line tangent to

expression at X=value.y <

DRAW

5:Tangent(

tanh(value)Returns hyperbolic tangent

of a real number,

expression, or list.

y N

tanh(

tanhL1(value)Returns the hyperbolic

arctangent of a real

number, expression, or list.

y N

tanhL1(

tcdf(lowerbound,

upperbound,df)Computes the Student-t

distribution probability

between lowerbound and

upperbound for the specified

degrees of freedom df.

y =

DISTR

6:tcdf(

unction or

Instruction/Arguments

Result Key or

Keys/Menu or

Screen/Item