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What have you tried to this point?
I suggest thinking about some double angle formulas for the first question.
i tried using the double angle formulas but dont know how to bring about the cot(A/2) for the first one .
For the first one I think it can be useful to work with the identities:
i did the fiirst one.
what about the second one??
Originally Posted by earthboy prove that:
please help... Use your double angle identities for sin(A) and cos(A) noting that
Since you want cot then you want to get cos(A/2) in the numerator rather than sin(A/2)
Right side: .
Multiply by . . . . . . . . . . . .
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