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Prove :cosx-cosy= -2sin(x+y/2)sin(x-y/2)
Prove: 2cot-2tanx= 4-2sec^2x / tanx
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Q.1 Prove the following identities:-
(i) tan^3x/1+tan^2x + cot^3x/1+cot^2 = 1-2sin^x cos^x/sinx cosx (ii)
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