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If 20 sin^(2) alpha+21 cos alpha-24=0 wh...

If `20 sin^(2) alpha+21 cos alpha-24=0` where `(7pi)/(4) lt alpha lt 2pi` then `cot alpha//2=`

A

`-3`

B

2

C

3

D

`-2`

Text Solution

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The correct Answer is:
A
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