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Rewrite the trigonometric expression $\cos\left(5x\right)\cos\left(3x\right)$ inside the integral
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$\int\frac{\cos\left(8x\right)+\cos\left(2x\right)}{2}dx$
Learn how to solve trigonometric integrals problems step by step online. Solve the trigonometric integral int(cos(5x)cos(3x))dx. Rewrite the trigonometric expression \cos\left(5x\right)\cos\left(3x\right) inside the integral. Take the constant \frac{1}{2} out of the integral. Simplify the expression inside the integral. We can solve the integral \int\cos\left(8x\right)dx by applying integration by parts method to calculate the integral of the product of two functions, using the following formula.