If tan theta + tan phi =a, and cot theta...

If `tan theta + tan phi =a`, and `cot theta + cot phi =b`, and `theta - phi = alpha ne 0`, then

A

`ab gt 4`

B

`ab=4`

C

`tan^(2)alpha =(ab(ab-4))/(a+b)^(2)`

D

`cot^(2)alpha =(ab(ab+4))/(a-b)^(2)`

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The correct Answer is:

A, C

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