$\lim_{x\to infinity}\left(\frac{1-\cos\left(x\right)}{2x^2}\right)$
$2cos\left(6t+120\right)+4sen\left(6t-60\right)$
$\left(4+a^2\right)\left(4-a^2\right)$
$32x-10+\left\{2-\left[2-\left(x+1\right)\right]+3\left(x+1\right)\right\}$
$6\left(a+8\right)$
$5x^4y-xy;\:x=-2;\:y=-3$
$5x-7^2-5x-75x+7+4$
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