Using the calculator in ALG mode, first we define functions f(t) and g(t):

Next, we move to the CASDIR sub-directory under HOME to change the value of variable PERIOD, e.g.,

(hold) §`J@)CASDI `2 K@PERIOD `

Return to the sub-directory where you defined functions f and g, and calculate the coefficients. Set CAS to Complex mode (see chapter 2) before trying the exercises. Function COLLECT is available in the ALG menu (‚×).

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HP 49g manual