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(x tan alpha+y cot alpha) (x cot alpha+y...

`(x tan alpha+y cot alpha) (x cot alpha+y tan alpha) -4xy cot^(2)2alpha=`

A

`x^(2)+y^(2)`

B

`4xy`

C

`(x+y)^(2)`

D

none of these

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The correct Answer is:
c
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