AITS

f(x) = Sin x + cos(√4-a²x).The fundamental frequency of f(x) is 4Ï€ ,then value of a is --

A. √15/2
B. -√15/2
C. √7/2
D.- √7/2

2 Answers

what is the period of cos (kx)

it is 2pi/k ?? ?

hence you want 2 pi/ k = 4 pi

k = 1/2

can you finish the rest?

yes.

yes. :)

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