Question

sin x + sin 3x
tan 2x
cOS X + cos 3x

Answer 1

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$\boxed\begin{minipage}{7cm}</p><p></p><p> Fundamental Trigonometric Identities \\ \\</p><p></p><p> \sin^2 \theta + \cos^2 \theta =1 \\ \\ </p><p>1 + \tan^2 \theta = \ sec^2 \theta \\ \\</p><p> 1 + \cot^2 \theta =\text {cosec^2 \, \theta </p><p></p><p> \end {minipage}$