$\left(secx+tanx\right)\left(1-sinx\right)$
$2xy-x^2-9=0$
$6x-2y\sqrt{\left(x^2+1\right)}\frac{\left(dy\right)}{dx}=0$
$\lim_{x\to2}\left(\frac{x^2-8}{x-2}\right)$
$50x+\frac{y}{2}\:;\:x=3\:\:y=600$
$5\cdot7+8$
$\log\left(x^2\right)=2$
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