What is the integral of tan(7x)sec^2(7x) ?

The integral of tan(7x)sec^2(7x) is 1/14 tan^2(7x)+C

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integral of tan(7x)sec^2(7x)

\int tan (7 x) sec^{2} (7 x) d x

\frac{1}{14} tan^{2} (7 x) + C

Solution steps

\int tan (7 x) sec^{2} (7 x) d x

Apply u-substitution

= \int \frac{u}{7} d u

Take the constant out:

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

= \frac{1}{7} \cdot \int u d u

Apply the Power Rule

= \frac{1}{7} \cdot \frac{u ^{2}}{2}

Substitute back

u = tan (7 x)

= \frac{1}{7} \cdot \frac{tan ^{2} ( 7 x )}{2}

Simplify

\frac{1}{7} \cdot \frac{tan ^{2} ( 7 x )}{2} : \frac{1}{14} tan^{2} (7 x)

= \frac{1}{14} tan^{2} (7 x)

Add a constant to the solution

= \frac{1}{14} tan^{2} (7 x) + C

What is the integral of tan(7x)sec^2(7x) ?
The integral of tan(7x)sec^2(7x) is 1/14 tan^2(7x)+C