1.

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

Answer»

`AB gt 4`
`ab=4`
`TAN^(2)ALPHA =(ab(ab-4))/(a+b)^(2)`
`cot^(2)alpha =(ab(ab+4))/(a-b)^(2)`

Answer :A::C


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