Question

Sintheeta1+sintheeta2+sintheeta3=3 find costheeta1

Answer 1

Answer:

$\sin \alpha (1) + \sin \alpha (2) + \sin \alpha (3) = 3 \\ = \sin \\ \alpha (1 + 2 + 3) = 3 \\ = \sin \alpha 6 = 3 \\ = \sin \alpha = \frac{3}{6} \\ = \sin \alpha = \frac{1}{2} \\ = \sin \alpha = \sin(30 \\ ) \\ = \alpha = 30 \\ = \cos( \alpha ) \\ = \cos(30) \\ = \frac{ \sqrt{3} }{2}$