$2\cos3x+1=0$
$\frac{-21x^8y^2}{-3y^5y^22}$
$\int\frac{x^2}{\left(x^3+4\right)^9}dx$
$8x=4x^2-1$
$4^{x-3}=\frac{1}{16}$
$\frac{25-36x^4}{5+6x^2}$
$\int_1^4\left(\frac{4x}{\left(3x-2\right)^2}\right)dx$
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