$\tan\left(x\right)^4\cdot\sec\left(x\right)^2-\tan\left(x\right)^2\cdot\sec\left(x\right)^2+\tan\left(x\right)^2$

$\frac{\left(17+z\right)}{\left(5-11z\right)}<=-\frac{1}{2}$

$\int_2^{\infty}\frac{1}{v^2+4v-5}dv$

$\left(x^2+3\right)\left(x+2\right)\left(x+4\right)$

$cos2x=-0.8$

$\frac{6x^2-31x+35}{2x-7}$

$-\frac{0.186}{9.3}$