$\tan\left(77\right)=\frac{h}{30+x}$
$0.9\cdot0.5$
$4\left(-3m+6xy-15m\right)+12xy+20m-4$
$xy'=-4y+xe^{\frac{x^5}{5}}$
$\lim_{x\to0}\left(\frac{\left(4x+sin\left(3x\right)\right)}{x\cdot sec\left(x\right)}\right)$
$\left(\frac{1-4x}{1}\right)\left(\frac{1+4x}{1+4x}\right)$
$26+\frac{1}{2}n=11$
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