यदि tan alpha = n tan beta और sin alpha...

यदि `tan alpha = n tan beta ` और `sin alpha = m sin beta`, तो `cos^(2) alpha` है-

A

`(m^(2))/(n^(2) + 1)`

B

`(m^(2))/(n^(2))`

C

`(m^(2)-1)/(n^(2)-1)`

D

`(m^(2)+1)/(n^(2) + 1)`

लिखित उत्तर

Verified by Experts

The correct Answer is:

C

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