$\frac{\sen^{2}45^{\circ}+\sen^{2}30^{\circ}}{\cos^{2}45^{\circ}+\sec^{2}45^{\circ}}$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{cos\left(11x\right)}{sin\left(8x\right)}\right)$
$m^2-14m^2-m^2$
$2,5+1,5$
$2z'+3z=8$
$\left(2x^2+5\right)\left(3x-2\right)$
$7r^4h^5+14rh^6$
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