Question

Prove that: (sin x + sin 3x + sin 5x) / (cos x + cos 3 x + cos 5 x) = tan 3x

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

First apply

SinA+sinB=2cos(A+B/2)sin(A-B/2)

in sin5x and sinx

Same in denominator we apply this identity in cosx and cos5x

Then take sin3 and cos3x common fron numerator and denominator respectively

We get the ans i.e

tan3x