यदि 3(cot^(2)phi - cos^(2)phi) = cos^(2)...

यदि `3(cot^(2)phi - cos^(2)phi) = cos^(2) phi`, जहाँ `0^(@) lt phi lt 90^(@)` है, तो `(tan^(2)phi + cosec^(2)phi + sin^(2)phi)` का मान है :

A

`(13)/(3)`

B

`(61)/(12)`

C

`(25)/(12)`

D

`(15)/(4)`

लिखित उत्तर

Verified by Experts

The correct Answer is:

B

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