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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

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The correct Answer is:
D
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