• 0_1545926914667_IMG_20181227_213645.jpg
    Ans: 3

  • @shreyas-varma first thing is f(x)f(x) must be a determinant. I think there is sum mistake as they hav given it as matrix.

    For d soln: open det using 3rd row. U will directly get cosBsinAcosAsinB=sin(AB)cosBsinA-cosAsinB=sin(A-B) form.

    U will get f(x)=constant=f(0)=2f(x)=constant=f(0)=2 in terms of sinsin and coscos

    So the ques reduces to summation of 2 counted 31 times. So answer is 6262

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