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Question

Prove the following trigonometric identities.

If a cos3 θ + 3 a cos θ sin2 θ = m, a sin3 θ + 3 a cos2 θ sin θ = n, prove that (m + n)2/3 + (m − n)2/3 = 2a2/3

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Solution

Given that,

We have to prove

Adding both the equations, we get

Also.

Therefore, we have

Hence proved.


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