What is the integral of cos(x)sec^7(x) ?

The integral of cos(x)sec^7(x) is tan(x)+(2tan^3(x))/3+(tan^5(x))/5+C

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integral of cos(x)sec^7(x)

\int cos (x) sec^{7} (x) d x

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

Solution steps

\int cos (x) sec^{7} (x) d x

Rewrite using trig identities

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

Apply u-substitution

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

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

Expand

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

= \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

= \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}

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

Substitute back

u = tan (x)

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

Add a constant to the solution

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

\int \frac{x ^{3} - 6 x + 5}{x} d x

y^{^{''}} - y = 0, y (0) = 2, y^{^{'}} (0) = - 2

\frac{\partial}{\partial x} (x x^{2} + y^{2} + z^{2})

\frac{d}{d x} (\frac{2}{4 - cos ( 2 x )})

\int \frac{1}{t ln ( t ^{2} )} d t

What is the integral of cos(x)sec^7(x) ?
The integral of cos(x)sec^7(x) is tan(x)+(2tan^3(x))/3+(tan^5(x))/5+C