$\left(-2\right)^5+8\left(-2\right)^4+2\left(-2\right)^3+4$
$\left(1+\tan^2a\right)\left(\cos a\right)=\sec a$
$\frac{2a+3b}{3a-2b}-\frac{3a+2b}{3a-2b}$
$25z^2+30z+16$
$\left(-3x^2+2x-1\right)\left(x^2+3x+1\right)$
$-190-\left(-3512\right)$
$x^2+x+1<0$
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