$\lim_{x\to\infty}\left(\frac{-2+x}{x}\right)^{3x}$
$5x-7+3xand3x-7+5x$
$p^2=49$
$\frac{1}{2}ab+\frac{1}{2}ab$
$2sen^2x+sen^2x\cdot tan^2x$
$\frac{x^{2}y}{x^{-6}y}$
$\left(7x^2-3y\right)\left(49x^4-21x^2y-9y^2\right)$
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