What is the integral of 31tan^5(x)sec^4(x) ?

The integral of 31tan^5(x)sec^4(x) is 31((tan^6(x))/6+(tan^8(x))/8)+C

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integral of 31tan^5(x)sec^4(x)

\int 31 tan^{5} (x) sec^{4} (x) d x

31 (\frac{tan ^{6} ( x )}{6} + \frac{tan ^{8} ( x )}{8}) + C

Solution steps

\int 31 tan^{5} (x) sec^{4} (x) d x

Take the constant out:

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

= 31 \cdot \int tan^{5} (x) sec^{4} (x) d x

Rewrite using trig identities

= 31 \cdot \int (1 + tan^{2} (x)) sec^{2} (x) tan^{5} (x) d x

Apply u-substitution

= 31 \cdot \int u^{5} (1 + u^{2}) d u

Expand

u^{5} (1 + u^{2}) : u^{5} + u^{7}

= 31 \cdot \int u^{5} + u^{7} d u

Apply the Sum Rule:

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

= 31 (\int u^{5} d u + \int u^{7} d u)

\int u^{5} d u = \frac{u ^{6}}{6}

\int u^{7} d u = \frac{u ^{8}}{8}

= 31 (\frac{u ^{6}}{6} + \frac{u ^{8}}{8})

Substitute back

u = tan (x)

= 31 (\frac{tan ^{6} ( x )}{6} + \frac{tan ^{8} ( x )}{8})

Add a constant to the solution

= 31 (\frac{tan ^{6} ( x )}{6} + \frac{tan ^{8} ( x )}{8}) + C

What is the integral of 31tan^5(x)sec^4(x) ?
The integral of 31tan^5(x)sec^4(x) is 31((tan^6(x))/6+(tan^8(x))/8)+C