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If 3 cot A = 4 find 1-tan2a/1+tan2a= cos2a-sin2a or not |
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Answer» Answer: no 1-tan2a/1+tan2a=COS 2a-sin 2a is not EQUAL Step-by-step EXPLANATION: Cot A=4/3 tan A =3/4, CosA=4/5 ,SinA=3/5 tan (2A) = 2tana/1-tan^2a = 2×3/4/1-(3/4)^2 tan 2A= 24/7 Cos 2A= Cos^2 A-Sin^2 A=(4/5)^2-(3/5)^2 =16/25-9/25 = 7/25 Sin2A=2Sin A Cos A=2×3/5×4/5=24/25 substitute all the VALUES at LHS and RHS 1-24/7/1+24/7=7/25-24/25 -17/31= -17/25 therefore it is not equal |
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