If sec x cos 5x+1=0 , where 0lt x lt 2...

If ` sec x cos 5x+1=0 `, where ` 0lt x lt 2pi `, then x=

A

`(pi)/(5),(pi)/(4)`

B

`(pi)/(5)`

C

`(pi)/(4)`

D

None of these

Verified by Experts

The correct Answer is:

C

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