Correct Answer - Option 1 : 0
Concept:
cos(A - B) = cos A cos B + sin A sin B
cos(A + B) = cos A cos B - sin A sin B
sin (90 - θ) = cos θ
Calculation:
S = cos 43 sin 43 - cos 47 sin 47
S = cos 43 sin (90 - 47) - cos (90 - 43) sin 47
S = cos 43 cos 47 - sin 43 sin 47
S = cos (43 + 47) {∵ cos(A + B) = cos A cos B - sin A sin B}
S = cos 90
S = 0
