Question

If sin A+ sinB+sinC=3 then find the value
Cos A+cos B + cos C​

Answer 1

Hi Bro!


sin A + sin B + sin C = 3

We know that the maximum value of sin is 1.

Therefore,

sin A = 1, sin B = 1, sin C = 3 (this satisfies the given equation)

The value of sin is 1 when the angle is 90 degrees.

That means, A = B = C = 90°

Now,

cos A + cos B + cos C = cos 90° + cos 90° + cos 90°

= 0 + 0 + 0

= 0

I hope that it may help you!