$\int\frac{\sqrt{1-x}}{x}dx$
$7 x ^ { 2 } + x 4 - y ^ { 2 } = 4$
$\int\cos^4\left(x+2\right)dx$
$-7a\left(4b^2-9a^2-4ab\right)$
$3x^2-9x-5y-2=0$
$-11x^2-4x^2$
$9x^4+4x^5+9x^2-5x^3-9x=0$
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