# If sina+sinb+sinc=3 Find value of cosa ...

If sina+sinb+sinc=3 Find value of cosa +cosb+ cosc

Lakshmi Narayanan 5 months, 1 week ago

Maximum value of sin Ф is 1. So sinA+sinB+sinC=3 means sin A = 1 sin B = 1 sin C = 1 Thus, A = B = C = 90 degree cos A = cos 90 = 0 cos B = cos 90 = 0 cos C = cos 90 = 0 cos A + cos B +cos C = 0

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