Hey.

a) By using the subsitution t= tan 1/2 x

prove that cosecx- cotx= tan 1/2x

b) use this result to show that tan15= 2- sqrt 3

THANK YOU!

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- Dec 2nd 2009, 07:49 AMOasis1993proving identities....
Hey.

a) By using the subsitution t= tan 1/2 x

prove that cosecx- cotx= tan 1/2x

b) use this result to show that tan15= 2- sqrt 3

THANK YOU! - Dec 2nd 2009, 10:21 PMGrandad