$10\left(3+8k\right)+9\left(k+3\right)$

$\lim_{x\to\infty}\left(\frac{e^x}{e^x+6}\right)$

$\sin^4\left(x\right)-cos^4\left(x\right)=\frac{3}{4}$

$\frac{\tan\left(x\right)}{1-\cos\left(w\right)}=\csc\left(x\right)\left(1-\sec\left(x\right)\right)$

$20x^2+29x+90$

$\left(-19+21\right)\cdot\left(-2\right)+\left(32-42\right)\cdot3$

$\int\frac{1}{x^3\left(x+2\right)}dx$