What is the integral of cos(1/5)x ?

The integral of cos(1/5)x is 1/2 cos(1/5)x^2+C

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integral of cos(1/5)x

\int cos (\frac{1}{5}) x d x

\frac{1}{2} cos (\frac{1}{5}) x^{2} + C

Solution steps

\int cos (\frac{1}{5}) x d x

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= cos (\frac{1}{5}) \cdot \int x d x

Apply the Power Rule

: \frac{x ^{2}}{2}

= cos (\frac{1}{5}) \frac{x ^{2}}{2}

Simplify

cos (\frac{1}{5}) \frac{x ^{2}}{2} : \frac{1}{2} cos (\frac{1}{5}) x^{2}

= \frac{1}{2} cos (\frac{1}{5}) x^{2}

Add a constant to the solution

= \frac{1}{2} cos (\frac{1}{5}) x^{2} + C

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What is the integral of cos(1/5)x ?
The integral of cos(1/5)x is 1/2 cos(1/5)x^2+C