$\sin^2b\left(1+\cot^2b\right)$
$\frac { 8 } { 1 x ^ { 3 } - 4 x ^ { 4 } }$
$\sqrt{5}\sqrt{16}$
$21\frac{1}{4}x^2-2$
$-0,02x^2+20x-100$
$\left(a+15\right)^3$
$6xe^{2x}+1e^x$
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