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Rewrite the trigonometric expression $\sin\left(5x\right)\cos\left(4x\right)$ inside the integral
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$\int\frac{\sin\left(9x\right)+\sin\left(x\right)}{2}dx$
Learn how to solve problems step by step online. Solve the trigonometric integral int(sin(5x)cos(4x))dx. Rewrite the trigonometric expression \sin\left(5x\right)\cos\left(4x\right) inside the integral. Take the constant \frac{1}{2} out of the integral. Simplify the expression inside the integral. The integral \frac{1}{2}\int\sin\left(9x\right)dx results in: -\frac{1}{18}\cos\left(9x\right).