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Apply the formula: $\int\cos\left(\theta \right)^2dx$$=\frac{1}{2}\theta +\frac{1}{4}\sin\left(2\theta \right)+C$
Learn how to solve definite integrals problems step by step online.
$\left[\left(\frac{1}{2}x+\frac{1}{4}\sin\left(2x\right)\right)\right]_{1}^{3}$
Learn how to solve definite integrals problems step by step online. Integrate the function cos(x)^2 from 1 to 3. Apply the formula: \int\cos\left(\theta \right)^2dx=\frac{1}{2}\theta +\frac{1}{4}\sin\left(2\theta \right)+C. Evaluate the definite integral. Simplify the expression inside the integral.