Question

sinθ∨1+sinθ∨2+sinθ∨3=3 find cosθ∨1+cosθ∨2+cosθ∨3

Answer 1

The highest value of sin theta can be 1. So putting 90° in place of theta will give 3. Therefore theta = 90°. So cos90° + cos²90° + cos³90° =0.
0 is the correct answer.