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

If `5cos2theta+2cos^(2)""(theta)/(2)+1=0 and -piltthetaltpi`, then find `theta`.

A

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

B

`pm(pi)/(3),pm[pi+cos^(-1)((3)/(5))]`

C

`pm(pi)/(2),pm[pi-cos^(-1)((3)/(5))]`

D

`pm(3pi)/(2),pm[pi-cos^(-1)((3)/(5))]`

लिखित उत्तर

Verified by Experts

The correct Answer is:

A

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