The following questions may kindly be answered.

CBSE Class 11-science Answered

The following questions may kindly be answered.

Asked by tps.mjmdr | 16 Jun, 2018, 08:37: PM

Expert Answer

cosθ + cos(∏+θ) + .....+cos(n∏+θ)

Consider,

cos(∏+θ) = cos∏cosθ - sin∏sinθ

As sinn∏ is always zero and cos∏ = -1

cos(∏+θ) = -cosθ

similarly cos2∏ = 1

Now we have two cases

i) n is odd

then cos(n∏+θ) = (-1)ⁿ cosθ = -cosθ

ii) n is even

then cos(n∏+θ) = (-1)ⁿ cosθ = cosθ

USe this and solve it further

Answered by Sneha shidid | 19 Jun, 2018, 11:04: AM

Answered Unanswered My Questions My Answers

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