$\frac{dx}{dt}=x+2e^t+y^2$
$\frac{\cos\left(2x\right)-\sin\left(x\right)}{\cos^2\left(x\right)}=\frac{1-2\sin\left(x\right)}{1-\sin\left(x\right)}$
$-54-\left(-72\right)$
$-969-748$
$\left(5z^2\right)^4$
$-0.6+\frac{1}{4}$
$\frac{3x^4-x^2+x}{x^3-2x}$
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