Which of the following identities , wher...

Which of the following identities , wherever defined , hold (s) good ?

A

`cot alpha - tan alpha = 2 cot 2 alpha`

B

`tan (45^(0) + alpha) - tan (45^(0) - alpha) = "2 cosec 2" alpha`

C

`tan (45^(0) + alpha) + tan (45^(0) - alpha) = 2 sec 2 alpha`

D

`tan alpha + cot alpha = 2 tan 2 alpha`

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The correct Answer is:

A, C

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