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Smallest positive x satisfying the equat...

Smallest positive x satisfying the equation ` cos^(3) 3x + cos^(3) 5x = 8 cos^(3) 4x * cos^(3) x ` is :

A

` 15^(@) `

B

` 18^(@) `

C

` 22.5^(@) `

D

` 30^(@) `

Text Solution

Verified by Experts

The correct Answer is:
B
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