$\log_x\left(y-18\right)=2$

$-36\:\left(-25\right)\:\left(-4\right)\:\left(-2\right)\:$

$\int_0^{\pi}\left(7\sin\left(x\right)\right)dx$

$-3\frac{1}{4}\:x\:-2\frac{3}{5}$

$-x+7,2x+2x-3,5+4$

$\lim_{x\to\infty}\left(\frac{1-\cos\left(x\right)\left(\sec\left(2x\right)\right)}{3x^3\csc\left(x\right)}\right)$

$\left(x-y\right)^2=\left(x^2+y^2\right)$