Solve ∫ sin(x+a)/cos(x-a)

$$\int \frac { \sin ( x + a ) } { \cos ( x - a ) }$$

Evaluate

$$\frac{-\cos(2a)\cos(x-a)\ln(|\cos(x-a)|)-x\cos(2a)\sin(x-a)+x\sin(x+a)}{\cos(x-a)}+С$$

Solution Steps

Simplify.

$$\frac{\sin(x+a)x}{\cos(x-a)}-\cos(2a)\left(\frac{x\sin(x-a)}{\cos(x-a)}+\ln(|\cos(x-a)|)\right)$$

If F\left(x\right) is an antiderivative of f\left(x\right), then the set of all antiderivatives of f\left(x\right) is given by F\left(x\right)+C. Therefore, add the constant of integration C\in \mathrm{R} to the result.

$$\frac{\sin(x+a)x}{\cos(x-a)}-\cos(2a)\left(\frac{x\sin(x-a)}{\cos(x-a)}+\ln(|\cos(x-a)|)\right)+С$$

Differentiate w.r.t. x

$$\frac{x\sin(x-a)\sin(x+a)+x\cos(x-a)\cos(x+a)+\cos(x-a)\sin(x+a)-x\cos(2a)}{\left(\cos(x-a)\right)^{2}}$$