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)= β0,25Β·(x β3)2+4
(-125)^2
3*3-3/3+3=
2x+5y=1,\:\:x-3y=2
