﻿ If cos 5θ = a cos θ + b cos3 θ + c cos5 θ + d, then : Kaysons Education

# If Cos 5θ = a cos θ + B Cos3 θ + c cos5 θ + d, Then

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## Question

### Solution

Correct option is

b = – 20 and c = 16

Clearly, a = 5, b = – 20, c = 16 and d = 0. Satisfy the given relation.

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