$\sin\theta\sec^{2}\theta-\sin^{3}\theta-\sec^{2}\theta$

$-7+\left(5-\left(3-\left(2-8\right)\right)\right)$

$1-\cos\left(x\right)^2=\sin\left(x\right)\cos\left(x\right)\tan\left(x\right)$

$\frac{\left(1-tan^2a\right)}{1-cot^2a}$

$\frac{1}{2}\frac{19.6}{5}$

$\frac{2x^2+3x+1}{\frac{7x+9}{3x-5}}$

$\int\left(5x+1\right)e^xdx$