What is the integral of 3x+cos(x) ?

The integral of 3x+cos(x) is (3x^2)/2+sin(x)+C

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integral of 3x+cos(x)

\int 3 x + cos (x) d x

\frac{3 x ^{2}}{2} + sin (x) + C

Solution steps

\int 3 x + cos (x) d x

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \int 3 x d x + \int cos (x) d x

\int 3 x d x = \frac{3 x ^{2}}{2}

\int cos (x) d x = sin (x)

= \frac{3 x ^{2}}{2} + sin (x)

Add a constant to the solution

= \frac{3 x ^{2}}{2} + sin (x) + C

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What is the integral of 3x+cos(x) ?
The integral of 3x+cos(x) is (3x^2)/2+sin(x)+C