new q

IF f(x)=cos[pi2]x + cos[-pi2]x,where [.] is the gif ,yhen value of f(pi) will b?
what i have recognised about this qyestion is that
this belongs to pi2-(9,10).

2 Answers

1
Manmay kumar Mohanty ·

f(x) will be reduced to cos 9x + cos 10x
now f(pi) = cos 9pi + cos 10pi = -1 + 1 = 0

1
ut10 ·

f(x)=cos 9x + cos 10x
therefore f(pi)=cos 9pi +cos 10pi=-1+1=0

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