यदि cot ^(-1) alpha + cot ^(-1) beta , ...

यदि `cot ^(-1) alpha + cot ^(-1) beta , = cot ^(-1) x,` तो x बराबर है -

A

`alpha + beta`

B

`(alpha beta -1)/(alpha + beta)`

C

`(1 + alpha beta)/( alpha + beta)`

D

`alpha - beta`

लिखित उत्तर

Verified by Experts

The correct Answer is:

B

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