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General solution of cos2x+3cosx=0 is...

General solution of `cos2x+3cosx=0` is

A

`npipmcos^(-1)((-3+sqrt(17))/(4)), ninZ`

B

`2npipmcos^(-1)((-3+sqrt(17))/(4)), ninZ`

C

`2npipmcos^(-1)((-3-sqrt(17))/(4)), ninZ`

D

`2npipmcos^(-1)((-3+sqrt(17))/(4)), ninZ`

Text Solution

Verified by Experts

The correct Answer is:
D
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