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

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

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

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

- 3 sec (x) + sec^{3} (x) + C

Solution steps

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

Take the constant out:

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

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

Rewrite using trig identities

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

Apply u-substitution

: \int - 1 + u^{2} d u

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

\int 1 d u = u

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

= 3 (- u + \frac{u ^{3}}{3})

Substitute back

u = sec (x)

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

Simplify

3 (- sec (x) + \frac{sec ^{3} ( x )}{3}) : - 3 sec (x) + sec^{3} (x)

= - 3 sec (x) + sec^{3} (x)

Add a constant to the solution

= - 3 sec (x) + sec^{3} (x) + C

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