$3x-1+4-2x$

$\left(ln\:\frac{1}{x}\right)^{\:^{e^{-x}}}$

$\frac{2\:\sin\left(x\right)+3}{\frac{2\sin\left(x\right)}{\cos\left(x\right)}+\frac{3}{\cos\left(x\right)}}=\cos\left(x\right)$

$x^4-30x+3\::\:x-3$

$\int_0^2x\left(x+1\right)\left(x+2\right)dx$

$\frac{7}{8}m+\frac{9}{10}-2m-\frac{3}{3}$

$\frac{\left(cost\right)}{\left(1+sect\right)}=\frac{\left(1-cost\right)}{\left(tan^2t\right)}$