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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Hello Oasis1993 Originally Posted by Oasis1993 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! If , then and .So: Put , noting that and , and you're done. Grandad
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