$-2sin\left(7x\right)\cdot sin\left(5x\right)$
$\frac{x}{2}-2<28$
$f\left(x\right)=8x^2+4x^5+2x^3$
$y\:+\:50\:-\:15$
$cos=\frac{9.4}{3.4}$
$\frac{\cos z^2-3\cos z+2}{\text{sen}^2z}=\frac{2-\cos z}{1+\cos z}$
$93a^3b^2c-63a^2b^3c^2-126a^2b+186ab^4c^2$
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