The principal solutions of the equation...

The principal solutions of the equations `sqrt(2)cosx-1=0` are

A

`(pi)/(5),(7pi)/(4)`

B

`(pi)/(4),(7pi)/(4)`

C

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

D

None of these

Verified by Experts

The correct Answer is:

B

Given, `sqrt(2)cosx-1=0`
`rArrcosx=(1)/(sqrt(2))`
`x=(pi)/(4),(7pi)/(4)`

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