What is the integral of (tan^3(x))/(cos^2(x)) ?

The integral of (tan^3(x))/(cos^2(x)) is (tan^4(x))/4+C

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integral of (tan^3(x))/(cos^2(x))

\int \frac{tan ^{3} ( x )}{cos ^{2} ( x )} d x

\frac{tan ^{4} ( x )}{4} + C

Solution steps

\int \frac{tan ^{3} ( x )}{cos ^{2} ( x )} d x

Rewrite using trig identities

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

Apply u-substitution

= \int u^{3} d u

Apply the Power Rule

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

Substitute back

u = tan (x)

= \frac{tan ^{4} ( x )}{4}

Add a constant to the solution

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

What is the integral of (tan^3(x))/(cos^2(x)) ?
The integral of (tan^3(x))/(cos^2(x)) is (tan^4(x))/4+C