Matrices

Ans: 3

@shreyasvarma first thing is
$f(x)$ 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
$cosBsinAcosAsinB=sin(AB)$ form.U will get
$f(x)=constant=f(0)=2$ in terms of$sin$ and$cos$ So the ques reduces to summation of 2 counted 31 times. So answer is
$62$