Question

if sin theta 1+sin theta 2+sin theta 3+...+sin 10=10(0

Answer 1

Given, sinθ

1

+sinθ

2

+sinθ

3

=3

This value is possible only if sinθ

1

=sinθ

2

=sinθ

3

=1

This is for θ

1

=θ

2

=θ

3

=

2

π

Thus cosθ

1

+cosθ

2

+cosθ

3

=0

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