$2x\frac{dx}{dy}=\sqrt{x+xy}-\sqrt{1+y}$
$65\cdot8$
$\:\frac{35\:x^3+\:21\:x^3\:+\:7\:x^4}{7\:x^2}$
$8+\left(2-5\right)-\left(4+3-2\right)-1$
$\frac{secx}{tgx+ctgx}=seny$
$-13+-8+2$
$\left(4c^3+2d\right)$
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