What is the integral of e^xsqrt(49-e^{2x)} ?

The integral of e^xsqrt(49-e^{2x)} is 49/2 (arcsin(1/7 e^x)+1/2 sin(2arcsin(1/7 e^x)))+C

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integral of e^xsqrt(49-e^{2x)}

\int e^{x} 49 - e^{2 x} d x

\frac{49}{2} (arcsin (\frac{1}{7} e^{x}) + \frac{1}{2} sin (2 arcsin (\frac{1}{7} e^{x}))) + C

Solution steps

\int e^{x} 49 - e^{2 x} d x

Apply u-substitution

: \int 49 - u^{2} d u

= \int 49 - u^{2} d u

Apply Trigonometric Substitution

: \int 49 cos^{2} (v) d v

= \int 49 cos^{2} (v) d v

Take the constant out:

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

= 49 \cdot \int cos^{2} (v) d v

Rewrite using trig identities

= 49 \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

= 49 \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

= 49 \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)

= 49 \cdot \frac{1}{2} (v + \frac{1}{2} sin (2 v))

Substitute back

= 49 \cdot \frac{1}{2} (arcsin (\frac{1}{7} e^{x}) + \frac{1}{2} sin (2 arcsin (\frac{1}{7} e^{x})))

Simplify

49 \cdot \frac{1}{2} (arcsin (\frac{1}{7} e^{x}) + \frac{1}{2} sin (2 arcsin (\frac{1}{7} e^{x}))) : \frac{49}{2} (arcsin (\frac{1}{7} e^{x}) + \frac{1}{2} sin (2 arcsin (\frac{1}{7} e^{x})))

= \frac{49}{2} (arcsin (\frac{1}{7} e^{x}) + \frac{1}{2} sin (2 arcsin (\frac{1}{7} e^{x})))

Add a constant to the solution

= \frac{49}{2} (arcsin (\frac{1}{7} e^{x}) + \frac{1}{2} sin (2 arcsin (\frac{1}{7} e^{x}))) + C

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What is the integral of e^xsqrt(49-e^{2x)} ?
The integral of e^xsqrt(49-e^{2x)} is 49/2 (arcsin(1/7 e^x)+1/2 sin(2arcsin(1/7 e^x)))+C