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If sec x cos 5x=-1 and 0 lt x lt (pi)/(...

If ` sec x cos 5x=-1 and 0 lt x lt (pi)/(4)`, then x is equal to

A

`(pi)/(6)`

B

`(pi)/(3)`

C

`(pi)/(4)`

D

None of these

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The correct Answer is:
A
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