What is the integral of 4/(sqrt(1-4x^2)) ?

The integral of 4/(sqrt(1-4x^2)) is 2arcsin(2x)+C

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integral of 4/(sqrt(1-4x^2))

\int \frac{4}{1 - 4 x ^{2}} d x

2 arcsin (2 x) + C

Solution steps

\int \frac{4}{1 - 4 x ^{2}} d x

Take the constant out:

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

= 4 \cdot \int \frac{1}{1 - 4 x ^{2}} d x

Apply Trigonometric Substitution

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

= 4 \cdot \int \frac{1}{2} d u

Take the constant out:

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

= 4 \cdot \frac{1}{2} \cdot \int 1 d u

Integral of a constant:

\int a d x = a x

= 4 \cdot \frac{1}{2} \cdot 1 \cdot u

Substitute back

u = arcsin (2 x)

= 4 \cdot \frac{1}{2} \cdot 1 \cdot arcsin (2 x)

Simplify

4 \cdot \frac{1}{2} \cdot 1 \cdot arcsin (2 x) : 2 arcsin (2 x)

= 2 arcsin (2 x)

Add a constant to the solution

= 2 arcsin (2 x) + C

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What is the integral of 4/(sqrt(1-4x^2)) ?
The integral of 4/(sqrt(1-4x^2)) is 2arcsin(2x)+C