Q14 of 25 Page 3

Prove that .4

Consider LHS ,


As we know sec θ = 1/cos θ


So,




As we know 1 – cos 2x = 2 sin2x


So,





As we know sin 2x = 2 sin x cos x


So,





= tan 8x cot 2x



= RHS


Hence proved


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