$\left(\frac{1}{2}a-\frac{1}{2}b\right)\cdot\left(\frac{1}{2}a+\frac{1}{2}b\right)$
$5+9a-2a^2$
$5.30\cdot10$
$-12x>4$
$\int\left(\arcsin\left(9x\right)\right)dx$
$\int\frac{1}{3+5x}dx$
$\sin^4=\sin^2\sin^2$
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