prove that cot A - tan A = 2 cot 2A
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Answered by
1
Answer:
cotA-tanA = 2.cot 2A
L.H.S.
=cosA/sinA-sina/cosA
=(cos^2A-sin^2A)/sinA.cosA
=(cos2A)/(1/2.sin2A)
=2.(cos2A/sin2A)
=2.cot2A , Proved.
Answered by
1
Answer:
cotA-tanA = 2.cot 2A L.H.S. =cosA/sinA-sina/ cosA =(cos^2A-sin^2A)/sinA.cosA =(cos2A)/(1 /2.sin2A) =2.(cos2A/sin2A) =2.cot2A ,
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