LHS - 2 sin 40 cos 80 cos 40 2 sin?...
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LHS - 2 sin 40 cos 80 cos 40 2 sin? 20 and LHS = 1 Sin 40 cos 40) (2 sin 40 cos 40) sin 40 cos 80 2 sin2 20 LHS - 2 sin 40 cos 40) (2 sin 20 cos 20 ) cos 80 2 sin? 20 sin 2(40)) cos 20) (sin 80) (co

JEE/Engineering Exams
Maths
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( begin{aligned} & frac{2 sin ^{2} 4 theta cos 4 theta}{cos 80 times 2 sin ^{2} 2 theta} & Rightarrow frac{2 sin 4 theta cos 4 theta times frac{sin 40}{cos 8 theta}}{sin 2 sin ^{2} 2 theta} &=sin 8 theta=2 sin 40 cos 40 sin 4 theta=& 2 sin theta cos 2 theta end{aligned} ) [ begin{aligned} frac{2 sin 4 theta times sin 4 theta times cos 4 theta}{cos 8 theta} &=frac{2 sin 2 theta cos 2 theta}{x sin ^{2} 2 theta} &=tan 8 theta times cot 2 theta end{aligned} ]
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