$\frac{\ n! - (n + 1)!}{\ n!}$
3*3-3/3+3=
$\frac{\ n! + (n + 1)!}{\ n!}$
3*3-3//3+3
derivation of solution for cos(x+y)
3g+5h+4g-2h
factorize y= -2x^2+9x-4
2^23624
cos(x+y)
A(x)= −0,25·(x −3)2+4
