Final answer to the problem
$\frac{1}{6}e^{3a}\cos\left(3a\right)+\frac{1}{6}e^{3a}\sin\left(3a\right)+C_0$
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We can solve the integral $\int e^{3a}\cos\left(3a\right)da$ by applying integration by parts method to calculate the integral of the product of two functions, using the following formula
$\displaystyle\int u\cdot dv=u\cdot v-\int v \cdot du$
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$\displaystyle\int u\cdot dv=u\cdot v-\int v \cdot du$
Learn how to solve problems step by step online. int(e^(3a)cos(3a))da. We can solve the integral \int e^{3a}\cos\left(3a\right)da by applying integration by parts method to calculate the integral of the product of two functions, using the following formula. First, identify or choose u and calculate it's derivative, du. Now, identify dv and calculate v. Solve the integral to find v.
Final answer to the problem
$\frac{1}{6}e^{3a}\cos\left(3a\right)+\frac{1}{6}e^{3a}\sin\left(3a\right)+C_0$
