What is the integral of tan^3(x/4)sec^3(x/4) ?

The integral of tan^3(x/4)sec^3(x/4) is 4((sec^5(x/4))/5-(sec^3(x/4))/3)+C

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integral of tan^3(x/4)sec^3(x/4)

\int tan^{3} (\frac{x}{4}) sec^{3} (\frac{x}{4}) d x

4 (\frac{sec ^{5} ( \frac{x}{4} )}{5} - \frac{sec ^{3} ( \frac{x}{4} )}{3}) + C

Solution steps

\int tan^{3} (\frac{x}{4}) sec^{3} (\frac{x}{4}) d x

Apply u-substitution

: \int tan^{3} (u) sec^{3} (u) \cdot 4 d u

= \int tan^{3} (u) sec^{3} (u) \cdot 4 d u

Take the constant out:

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

= 4 \cdot \int tan^{3} (u) sec^{3} (u) d u

Rewrite using trig identities

= 4 \cdot \int (- 1 + sec^{2} (u)) tan (u) sec^{3} (u) d u

Apply u-substitution

: \int v^{2} (v^{2} - 1) d v

= 4 \cdot \int v^{2} (v^{2} - 1) d v

Expand

v^{2} (v^{2} - 1) : v^{4} - v^{2}

= 4 \cdot \int v^{4} - v^{2} 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

= 4 (\int v^{4} d v - \int v^{2} d v)

\int v^{4} d v = \frac{v ^{5}}{5}

\int v^{2} d v = \frac{v ^{3}}{3}

= 4 (\frac{v ^{5}}{5} - \frac{v ^{3}}{3})

Substitute back

= 4 (\frac{sec ^{5} ( \frac{x}{4} )}{5} - \frac{sec ^{3} ( \frac{x}{4} )}{3})

Add a constant to the solution

= 4 (\frac{sec ^{5} ( \frac{x}{4} )}{5} - \frac{sec ^{3} ( \frac{x}{4} )}{3}) + C

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What is the integral of tan^3(x/4)sec^3(x/4) ?
The integral of tan^3(x/4)sec^3(x/4) is 4((sec^5(x/4))/5-(sec^3(x/4))/3)+C