What is the integral of sin(10x)sin(20x) ?

The integral of sin(10x)sin(20x) is 1/2 (1/10 sin(10x)-1/30 sin(30x))+C

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integral of sin(10x)sin(20x)

\int sin (10 x) sin (20 x) d x

\frac{1}{2} (\frac{1}{10} sin (10 x) - \frac{1}{30} sin (30 x)) + C

Solution steps

\int sin (10 x) sin (20 x) d x

Rewrite using trig identities

= \int \frac{1}{2} (- cos (30 x) + cos (- 10 x)) d x

Take the constant out:

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

= \frac{1}{2} \cdot \int - cos (30 x) + cos (- 10 x) d x

Simplify

- cos (30 x) + cos (- 10 x) : cos (10 x) - cos (30 x)

= \frac{1}{2} \cdot \int cos (10 x) - cos (30 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

= \frac{1}{2} (\int cos (10 x) d x - \int cos (30 x) d x)

\int cos (10 x) d x = \frac{1}{10} sin (10 x)

\int cos (30 x) d x = \frac{1}{30} sin (30 x)

= \frac{1}{2} (\frac{1}{10} sin (10 x) - \frac{1}{30} sin (30 x))

Add a constant to the solution

= \frac{1}{2} (\frac{1}{10} sin (10 x) - \frac{1}{30} sin (30 x)) + C

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What is the integral of sin(10x)sin(20x) ?
The integral of sin(10x)sin(20x) is 1/2 (1/10 sin(10x)-1/30 sin(30x))+C