$\int_0^{\infty}\left(\frac{1}{\sqrt{x^2+81}}-c\frac{1}{\left(x+8\right)}\right)dx$

$34^0$

$5\sec^2\left(x\right)+4=9\sec\left(x\right)^2-4\tan\left(x\right)$

$1-3+1+5$

$\sin\left(\arcsin\left(0.5\right)+\arctan\left(-3\right)\right)$

$1+9b+2+3b$

$\frac{3}{4}x\left(16x+8y-4\right)$