$12cos^2\left(x\right)-5cos\left(x\right)-2=0$
$x ^ { 3 } + \frac { 5 x ^ { 2 } - 9 x + 30 } { x + 7 }$
$x^{2}+4<2$
$18x^2y-24xy^2$
$4yz^2-2y^3z^3$
$\left(tanx\right)\left(1-cotx\right)=tan\:x-1$
$5x+6-4x=3x-12$
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