$\lim_{h\to0}\left(\frac{tan2\left(x+h\right)-tan\left(2x\right)}{h}\right)$
$\frac{cos\left(a\right)}{sin\left(a\right)+1}\:+\:tan\left(a\right)$
$x^2=y-3$
$\frac{dy}{dt}\:2y+1$
$8ab-12a+12a$
$\left(1-3x\right)^2\cdot e^{4x}$
$-3+2\cdot\left(-2\right)+\left(-5\right)+1$
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