# Prove That (Sin X + Sin 3x)/(Cos X + Cos 3x) = Tan 2x - Mathematics

Prove that  (sin x + sin 3x)/(cos x + cos 3x) = tan 2x

#### Solution

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#### APPEARS IN

NCERT Class 11 Mathematics Textbook
Chapter 3 Trigonometric Functions
Q 19 | Page 73