$d^2-36d$

$\frac{d}{dx}\sqrt{\frac{\sin x+1}{1-\sin x}}$

$\int2xf^{6x}dx$

$\:\left(-7a-6\right)+\left(-5a+3\right)$

$3y-2z-3x-\left(x-\left[y-\left(z-x\right)\right]-2x\right)$

$\int\frac{10x^2-30x+23}{2x^3-5x^2-2x+5}dx$

$\int x\left(\frac{7}{x^6}-sin\left(x\right)+\sqrt{x}\:\right)dx$