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Question

If sin5θ=cos4θ, where 5θ and 4θ are acute angles, then the value of θ is

A
15
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B
8
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C
10
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D
12
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Solution

The correct option is C 10
Given, sin5θ=cos4θ
cos(9005θ)=cos4θ
9005θ=4θ
9θ=900
θ=100

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