$4x\ge5x-7$
$1+\frac{\senx\cdot\ctg^{2}x}{1+\senx}=\csc x$
$\int\:\frac{9\cos\left(x\right)}{9\cos\left(x\right)}dx$
$\left(2+3x\right)\left(2+8x\right)$
$\lim_{x\to\infty}\left(1-\frac{2x}{3}\right)^{\frac{2x+3}{5x}}$
$20x^22-24y^2+17xy$
$234\cdot215$
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