$\int\frac{\left(\sqrt{x}+1\right)}{x}dx$
$\frac{sin\:a}{1+cos\:a}=\frac{1-cosa}{sina}$
$\sqrt{x^2-2x^2}$
$\int\frac{5}{2\left(9x^2+1\right)^2}dx$
$4sin^2x+2cos^2x=3$
$60\cdot60\cdot48\cdot48$
$2x+1\ge-1x+1$
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