$-10a+8a+a-8a$
$x-5=x-5$
$\frac{\sin^2\left(\frac{3\pi}{2}+x\right)-\sin\left(\pi+x\right)\cdot\sin\left(x\right)}{\cos\left(\frac{\pi}{2}+x\right)}$
$1+\frac{1}{\sin^2\left(x\right)}$
$\left(x^4+5x^3+x^2+20x-12\right):\left(x^2+4\right)$
$x-5<0$
$y^2-2y=3$
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