$-8.6-\left(-4.3\right)$
$-2\cos^2\left(x\right)+\sin\left(x\right)=-1$
$\left(4a^2+3b^3\right)\left(4a^2-3b^3\right)$
$x^2+5x-24$
$\left(\frac{z}{2}\right)^2$
$\frac{1-secx}{1-cosx}$
$f\left(x\right)=x^2\left(1+x\right)^2$
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