$t^2-8t+25$
$\sec\left(c\right)-\cos\left(c\right)=\sin\left(c\right)\tan\left(c\right)$
$\left(3+2i\right)+\left(4+5i\right)$
$1-cos2x=tanx\cdot sin2x$
$\frac{d}{dx}xy=6$
$100-140+49y^2$
$\frac{dy}{dx}=2x^2\sqrt{y}$
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