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If f (x) = cos[π^2] x + cos[-π^2]x , then

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If f(x) = cos[π2] x + cos[-π2]x , then

(A)  f(π/4) = 2

(B)  f(-π) = 2

(C)  f(π) = 1

(d)  f(π/2) = -1

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Best answer

Correct option (d)  f(π/2) = -1

Explanation :

We have

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