$\int18sin^7\left(9x\right)cos^8\left(9x\right)dx$
$7x-7\cdot x-9$
$8+3\left(2+5\right)-4\left(1+2\right)+3\left(2+4\right)$
$5y<2$
$\frac{1}{4}-\frac{1}{4}\cos\left(2x\right)=\frac{1}{8}\sin\left(x\right)^2$
$2x^3+3x^2-3x-2$
$\int4000xe^{-0.2}dx$
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