24 Prove that (1+tan A + cos A) (sin A -cos A)
= sin A tan A-cot A cos A.
C
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tanA),((1-cotA)+(cotA),((1-tanA)=(1+tanA+cotA )` tan A+ cotA(1-tan A) = (1 + tan A+ cot A).(1- cot. ... sin+tan2A1+cot2A=(1-tanA1-cotA)2=tan 2A. ... If A+B+C=pi,
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