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- Integrate using trigonometric identities
- Integrate by partial fractions
- Integrate by substitution
- Integrate by parts
- Integrate using tabular integration
- Integrate by trigonometric substitution
- Weierstrass Substitution
- Integrate using basic integrals
- Product of Binomials with Common Term
- FOIL Method
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Rewrite the trigonometric expression $\cos\left(3x\right)\cos\left(6x\right)$ inside the integral
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$\int\frac{\cos\left(9x\right)+\cos\left(-3x\right)}{2}dx$
Learn how to solve problems step by step online. Solve the trigonometric integral int(cos(3x)cos(6x))dx. Rewrite the trigonometric expression \cos\left(3x\right)\cos\left(6x\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\cos\left(9x\right)dx results in: \frac{1}{18}\sin\left(9x\right).