$\cos^2x-3\cos x-4$
$f\left(x\right)=\:sinx\left(x+sinx\right)$
$\int\left(\frac{\left(x+y\right)^3}{\sqrt{x}}\right)dx$
$\frac{sin\left(2x\right)\cos\left(x\right)-cos\left(2x\right)sin\left(x\right)}{\sin\left(x\right)cos\left(x\right)}=\frac{1}{cos\left(x\right)}$
$6b-b-6b$
$\frac{800}{-20}$
$\:125z^3\:+\:64$
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