What is the integral of cos(x)sqrt(9-sin^2(x)) ?

The integral of cos(x)sqrt(9-sin^2(x)) is 9/2 (arcsin(1/3 sin(x))+1/2 sin(2arcsin(1/3 sin(x))))+C

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integral of cos(x)sqrt(9-sin^2(x))

\int cos (x) 9 - sin^{2} (x) d x

\frac{9}{2} (arcsin (\frac{1}{3} sin (x)) + \frac{1}{2} sin (2 arcsin (\frac{1}{3} sin (x)))) + C

Solution steps

\int cos (x) 9 - sin^{2} (x) d x

Apply u-substitution

= \int 9 - u^{2} d u

Apply Trigonometric Substitution

= \int 9 cos^{2} (v) d v

Take the constant out:

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

= 9 \cdot \int cos^{2} (v) d v

Rewrite using trig identities

= 9 \cdot \int \frac{1 + cos ( 2 v )}{2} d v

Take the constant out:

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

= 9 \cdot \frac{1}{2} \cdot \int 1 + cos (2 v) d v

Apply the Sum Rule:

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

= 9 \cdot \frac{1}{2} (\int 1 d v + \int cos (2 v) d v)

\int 1 d v = v

\int cos (2 v) d v = \frac{1}{2} sin (2 v)

= 9 \cdot \frac{1}{2} (v + \frac{1}{2} sin (2 v))

Substitute back

= 9 \cdot \frac{1}{2} (arcsin (\frac{1}{3} sin (x)) + \frac{1}{2} sin (2 arcsin (\frac{1}{3} sin (x))))

Simplify

9 \cdot \frac{1}{2} (arcsin (\frac{1}{3} sin (x)) + \frac{1}{2} sin (2 arcsin (\frac{1}{3} sin (x)))) : \frac{9}{2} (arcsin (\frac{1}{3} sin (x)) + \frac{1}{2} sin (2 arcsin (\frac{1}{3} sin (x))))

= \frac{9}{2} (arcsin (\frac{1}{3} sin (x)) + \frac{1}{2} sin (2 arcsin (\frac{1}{3} sin (x))))

Add a constant to the solution

= \frac{9}{2} (arcsin (\frac{1}{3} sin (x)) + \frac{1}{2} sin (2 arcsin (\frac{1}{3} sin (x)))) + C

7 x y^{^{'}} - 2 y = \frac{- x ^{2}}{y ^{6}}

\frac{d}{d x} (5 x^{2} + 3 x)

y^{^{''}} - 2 y^{^{'}} + y = 12 t e^{t} + 2 e^{t} + t - 4

\frac{d}{d x} (8 x - 2 x^{2})

x \to - 6 lim (36 - x^{2})

What is the integral of cos(x)sqrt(9-sin^2(x)) ?
The integral of cos(x)sqrt(9-sin^2(x)) is 9/2 (arcsin(1/3 sin(x))+1/2 sin(2arcsin(1/3 sin(x))))+C