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Q.2The function f(x) is defined by f(x)=...

Q.2The function f(x) is defined by f(x)=cos-x + K cos22x + sinx, where K is a constant. If the functionf(x) is a constant function, the value of k is(1)-1(B)-1/2(D) 1/2 (E) 1(C) 0

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