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If alpha+beta=90^@, and alpha=2 beta, th...

If `alpha+beta=90^@`, and `alpha=2 beta`, then the value of `3 cos^2 alpha-2 sin^2 beta` is:
यदि `alpha+beta=90^@`, और `alpha=2 beta`, तो `3 cos^2 alpha-2 sin^2 beta` का मान ज्ञात करें:

A

`1/4`

B

`3/2`

C

`4/3`

D

`3/4`

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