$\frac{\cos^{2}x-\cos x-\sin^{2}x}{2\sin x\cos x+\sin x}$
$5x^2+y^8-6xy^2-1;\:x=1;\:y=\sqrt{2}$
$\frac{x^5}{x}-8x^3+x+6$
$-5+y=-37$
$\int\frac{2cosx}{2cosx}dx$
$\left(19-16+13\right)-12-\left(18-17+11\right)$
$24+0,85+3,1+5,128$
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