What is the integral of (cot(5x)+csc(5x))^2 ?

The integral of (cot(5x)+csc(5x))^2 is 2/5 (-cot((5x)/2)-arctan(tan((5x)/2)))+C

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integral of (cot(5x)+csc(5x))^2

\int (cot (5 x) + csc (5 x))^{2} d x

\frac{2}{5} (- cot (\frac{5 x}{2}) - arctan (tan (\frac{5 x}{2}))) + C

Solution steps

\int (cot (5 x) + csc (5 x))^{2} d x

Apply u-substitution

: \int (cot (u) + csc (u))^{2} \frac{1}{5} d u

= \int (cot (u) + csc (u))^{2} \frac{1}{5} d u

Take the constant out:

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

= \frac{1}{5} \cdot \int (cot (u) + csc (u))^{2} d u

Apply u-substitution

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

= \frac{1}{5} \cdot \int \frac{2}{v ^{2} ( 1 + v ^{2} )} d v

Take the constant out:

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

= \frac{1}{5} \cdot 2 \cdot \int \frac{1}{v ^{2} ( 1 + v ^{2} )} d v

Take the partial fraction of

\frac{1}{v ^{2} ( 1 + v ^{2} )} : \frac{1}{v ^{2}} - \frac{1}{v ^{2} + 1}

= \frac{1}{5} \cdot 2 \cdot \int \frac{1}{v ^{2}} - \frac{1}{v ^{2} + 1} d v

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \frac{1}{5} \cdot 2 (\int \frac{1}{v ^{2}} d v - \int \frac{1}{v ^{2} + 1} d v)

\int \frac{1}{v ^{2}} d v = - \frac{1}{v}

\int \frac{1}{v ^{2} + 1} d v = arctan (v)

= \frac{1}{5} \cdot 2 (- \frac{1}{v} - arctan (v))

Substitute back

= \frac{1}{5} \cdot 2 (- \frac{1}{tan ( \frac{5 x}{2} )} - arctan (tan (\frac{5 x}{2})))

Simplify

\frac{1}{5} \cdot 2 (- \frac{1}{tan ( \frac{5 x}{2} )} - arctan (tan (\frac{5 x}{2}))) : \frac{2}{5} (- cot (\frac{5 x}{2}) - arctan (tan (\frac{5 x}{2})))

= \frac{2}{5} (- cot (\frac{5 x}{2}) - arctan (tan (\frac{5 x}{2})))

Add a constant to the solution

= \frac{2}{5} (- cot (\frac{5 x}{2}) - arctan (tan (\frac{5 x}{2}))) + C

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What is the integral of (cot(5x)+csc(5x))^2 ?
The integral of (cot(5x)+csc(5x))^2 is 2/5 (-cot((5x)/2)-arctan(tan((5x)/2)))+C