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

C

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

D

`tanalpha + cot alpha = 2 tan 2 alpha `.

Text Solution

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The correct Answer is:
A, C
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