Prove: 1/2(cotA-tanA)=Cot2A
1/2((CosA/SinA)-(SinA/CosA)) .... Take common denominator
(Cos2A-Sin2A)/2SinACosA) .... But Cos2A-Sin2A = Cos2A ..and 2SinACosA=Sin2A
Therefore (Cos2A/Sin2A) = Cot2A
Frank L.
asked • 11/20/16Trig Proof
Prove: 1/2(cotA-tanA) = cot2A
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