$\int\frac{\left(x^2-b^2\right)}{a}dx$
$\sin^20\cos^20=1$
$9^{x+4}=81^{x-6}$
$\sqrt{\frac{x}{\sqrt{x\:+2}}}$
$-2a^3\left(3+2xy-5ax^2\right)$
$2x\:+1,\:para\:x=1$
$1234-899.002$
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