$\left(7ax^4+9y^5\right)\left(7ax^4+9y^5\right)$
$\lim_{x\to0}\left(x-4\right)^2$
$sin\:4x=8\:sin\:x\:cos^3\:x-4\:sin\:x\:cos\:x$
$\int e^{6x-7}dx$
$\frac{x}{\left(2x+\sqrt{x}\right)}$
$17^2$
$x^2+4x=5$
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