$\lim_{x\to0}-7cot\left(2x\right)sin\left(6x\right)$
$\left(4x^3-5x^2-x-6\right)\left(2x^2-3x+4-5x^3\right)$
$x^2\cdot\left(x+y\right)^2$
$\frac{1+\text{senx}}{\cos x}+\frac{\cos x}{1+\text{senx}}=2\sec x$
$5-5b=50$
$25x^2-25x+1$
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