Question

Value of sin 35
sin 85 + sin 50° is

Answer 1

Step-by-step explanation:

Given sin 50 sin 35 or we can take as

sin 35 sin 50 multiply and divide by 2

So 1/2 x 2 sin 50 cos 85

We have the formula 2 cos A sin B = sin(A + B) - sin (A - B)

50 + 85 = 135 and

1/2 ( sin 135 - sin 35)

1/2(sin (90 + 45) - sin 35

sin(90 + a) = cos a

1/2 (cos 45 - sin 35)

1/2 (1/12 - sin 35)

1/2 (1 - 12 sin 35)/22 (proved)