$\frac{dx}{dt}=x+2e^t+y^2$
$6cmcg$
$\frac{\cot\theta-1}{\cot\theta+1}$
$x^2y^2-x^2yz$
$12a^2+ab$
$3y^2dy=dx$
$\cos\left(2x\right)\cdot\cos\left(x\right)-\sin\left(4x\right)\cdot\sin\left(x\right)=\cos\left(3x\right)\cdot\cos\left(2x\right)$
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