What is the integral of (cos(x)+1) ?

The integral of (cos(x)+1) is sin(x)+x+C

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integral of (cos(x)+1)

\int (cos (x) + 1) d x

sin (x) + x + C

Solution steps

\int cos (x) + 1 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 cos (x) d x + \int 1 d x

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

\int 1 d x = x

= sin (x) + x

Add a constant to the solution

= sin (x) + x + C