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If 5cos2theta+2"cos"^(2)(theta)/(2)+1=0,...

If `5cos2theta+2"cos"^(2)(theta)/(2)+1=0`, when `(0ltthetaltpi)`, then the values of `theta` are

A

`pi//3`

B

`pi//3,cos^(-1)(3//5)`

C

`cos^(-1)(3//5)`

D

`pi//3,pi-cos^(-1)(3//5)`

Text Solution

Verified by Experts

The correct Answer is:
D
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