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

The integral of sec^4(y)tan^3(y) is (tan^4(y))/4+(tan^6(y))/6+C

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integral of sec^4(y)tan^3(y)

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

\frac{tan ^{4} ( y )}{4} + \frac{tan ^{6} ( y )}{6} + C

Solution steps

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

Rewrite using trig identities

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

Apply u-substitution

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

Expand

u^{3} (1 + u^{2}) : u^{3} + u^{5}

= \int u^{3} + u^{5} 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 u^{3} d u + \int u^{5} d u

\int u^{3} d u = \frac{u ^{4}}{4}

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

= \frac{u ^{4}}{4} + \frac{u ^{6}}{6}

Substitute back

u = tan (y)

= \frac{tan ^{4} ( y )}{4} + \frac{tan ^{6} ( y )}{6}

Add a constant to the solution

= \frac{tan ^{4} ( y )}{4} + \frac{tan ^{6} ( y )}{6} + C

What is the integral of sec^4(y)tan^3(y) ?
The integral of sec^4(y)tan^3(y) is (tan^4(y))/4+(tan^6(y))/6+C