Question

Value of sin (37°) cos (53°) is:

​

Answer 1

sin 37° cos53°

sin(90-53°) cos 53°

cos53°.cos53°

1/2(2cos53°.cos53)

1/2(cos106°+cos0°)

1/2{cos(60+36)+1}

1/2(cos60.cos36-sin60sin36+1)

1/2(1/2.1/4√5+1-√3/2.1/4√10-2√5)+1

cos²(45+18)