$2n=64$
$\int-\frac{6}{7t\sqrt{49t^2-25}}dt$
$1+\frac{\senx\cdot\ctg^{2}x}{1+\senx}=\csc x$
$\frac{dy}{dt}=y^3-11y^2+10y+72$
$6rs^2-18rs+42rs^2s^2$
$\frac{3}{5}a-2b+\frac{1}{10}a-\frac{1}{3}b+2b-2a$
$5\:a\:+2\:\:\:\:\:\:2\:\:\:\:\:-\:\:3\:6\:\:\:x\:4\:y\:6\:$
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