Trigonometric Integrals Involving Factor Formulae Q2

Trigonometric Integrals Involving Factor Formulae Q2

\(\displaystyle\displaystyle \displaystyle\int{\sin 7x\sin 2xdx}\)

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Answer:\(-\frac{1}{18}\sin 9x + \frac{1}{10}\sin 5x + C\)

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