$\frac{ds}{dt}=\frac{s}{t^4}$
$14+\left(-18\right)-\left(-17\right)-4$
$9x^2+16y^2=49$
$\lim_{x\to0}\left(\frac{1}{2^x}\right)$
$\left(\sqrt{x}+2\sqrt{y}\right)\left(2\sqrt{x}-\sqrt{y}\right)$
$\lim x->\infty\left(\sqrt{x^2+2x+2}-\sqrt{x^2-2x+2}\right)$
$\frac{\left(\left(sinx+cosx\right)^2-1\right)}{cos^2x}=2tanx$
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