What is the integral of 3sec^6(x) ?

The integral of 3sec^6(x) is 3tan(x)+2tan^3(x)+3/5 tan^5(x)+C

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integral of 3sec^6(x)

\int 3 sec^{6} (x) d x

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

Solution steps

\int 3 sec^{6} (x) d x

Take the constant out:

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

= 3 \cdot \int sec^{6} (x) d x

Rewrite using trig identities

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

Apply u-substitution

: \int (1 + u^{2})^{2} d u

= 3 \cdot \int (1 + u^{2})^{2} d u

Expand

(1 + u^{2})^{2} : 1 + 2 u^{2} + u^{4}

= 3 \cdot \int 1 + 2 u^{2} + u^{4} 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

= 3 (\int 1 d u + \int 2 u^{2} d u + \int u^{4} d u)

\int 1 d u = u

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

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

= 3 (u + \frac{2 u ^{3}}{3} + \frac{u ^{5}}{5})

Substitute back

u = tan (x)

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

Simplify

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

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

Add a constant to the solution

= 3 tan (x) + 2 tan^{3} (x) + \frac{3}{5} tan^{5} (x) + C

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What is the integral of 3sec^6(x) ?
The integral of 3sec^6(x) is 3tan(x)+2tan^3(x)+3/5 tan^5(x)+C