What is the integral of (sin(2x))/(10+cos^2(x)) ?

The integral of (sin(2x))/(10+cos^2(x)) is -ln|cos(2x)+21|+C

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integral of (sin(2x))/(10+cos^2(x))

\int \frac{sin ( 2 x )}{10 + cos ^{2} ( x )} d x

- ln ∣ cos (2 x) + 21 ∣ + C

Solution steps

\int \frac{sin ( 2 x )}{10 + cos ^{2} ( x )} d x

Rewrite using trig identities

= \int \frac{2 sin ( 2 x )}{cos ( 2 x ) + 21} d x

Take the constant out:

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

= 2 \cdot \int \frac{sin ( 2 x )}{cos ( 2 x ) + 21} d x

Apply u-substitution

: \int - \frac{1}{2 u} d u

= 2 \cdot \int - \frac{1}{2 u} d u

Take the constant out:

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

= 2 (- \frac{1}{2} \cdot \int \frac{1}{u} d u)

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 2 (- \frac{1}{2} ln ∣ u ∣)

Substitute back

u = cos (2 x) + 21

= 2 (- \frac{1}{2} ln ∣ cos (2 x) + 21 ∣)

Simplify

2 (- \frac{1}{2} ln ∣ cos (2 x) + 21 ∣) : - ln ∣ cos (2 x) + 21 ∣

= - ln ∣ cos (2 x) + 21 ∣

Add a constant to the solution

= - ln ∣ cos (2 x) + 21 ∣ + C

\frac{s + 2}{s ^{2} + 2 s + 5} \cdot \frac{1}{s}

\frac{d ^{2}}{d x ^{2}} (\frac{2}{x})

\int (\frac{sin ( x )}{x})^{2} d x

y^{^{''}} - 12 y^{^{'}} + 37 y = 0, y (0) = 6, y^{^{'}} (0) = 8

\frac{d}{d x} (3 (5 x^{4} + 5 x^{3})^{4})

What is the integral of (sin(2x))/(10+cos^2(x)) ?
The integral of (sin(2x))/(10+cos^2(x)) is -ln|cos(2x)+21|+C