What is the integral of 1/(sin(x)+2cos(x)+3) ?

The integral of 1/(sin(x)+2cos(x)+3) is arctan(1/2 (tan(x/2)+1))+C

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integral of 1/(sin(x)+2cos(x)+3)

\int \frac{1}{sin ( x ) + 2 cos ( x ) + 3} d x

arctan (\frac{1}{2} (tan (\frac{x}{2}) + 1)) + C

Solution steps

\int \frac{1}{sin ( x ) + 2 cos ( x ) + 3} d x

Apply u-substitution

: \int \frac{2}{u ^{2} + 2 u + 5} d u

= \int \frac{2}{u ^{2} + 2 u + 5} d u

Take the constant out:

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

= 2 \cdot \int \frac{1}{u ^{2} + 2 u + 5} d u

Complete the square

u^{2} + 2 u + 5 : (u + 1)^{2} + 4

= 2 \cdot \int \frac{1}{( u + 1 ) ^{2} + 4} d u

Apply u-substitution

: \int \frac{1}{v ^{2} + 4} d v

= 2 \cdot \int \frac{1}{v ^{2} + 4} d v

Apply Integral Substitution

= 2 \cdot \int \frac{1}{2 ( w ^{2} + 1 )} d w

Take the constant out:

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

= 2 \cdot \frac{1}{2} \cdot \int \frac{1}{w ^{2} + 1} d w

Use the common integral:

\int \frac{1}{w ^{2} + 1} d w = arctan (w)

= 2 \cdot \frac{1}{2} arctan (w)

Substitute back

= 2 \cdot \frac{1}{2} arctan (\frac{tan ( \frac{x}{2} ) + 1}{2})

Simplify

2 \cdot \frac{1}{2} arctan (\frac{tan ( \frac{x}{2} ) + 1}{2}) : arctan (\frac{1}{2} (tan (\frac{x}{2}) + 1))

= arctan (\frac{1}{2} (tan (\frac{x}{2}) + 1))

Add a constant to the solution

= arctan (\frac{1}{2} (tan (\frac{x}{2}) + 1)) + C

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What is the integral of 1/(sin(x)+2cos(x)+3) ?
The integral of 1/(sin(x)+2cos(x)+3) is arctan(1/2 (tan(x/2)+1))+C