1+2cos(p/2 - a)*cos(-a)
2cos(p/2-a) = 2sin(a)
cos(-a) = cos(a)
1+2cos(a)*sin(a) = sin(a)^2 + 2cos(a)sin(a) + cos(a)^2 = (cos(a)+sin(a))^2
Либо
1+2cos(a)*sin(a) = 1+sin(2a)
X^3-121x=0
x(x^2-121)=0
1) x=0
2) x^2-121=0
x^2=121
x=+ - 11
350 простые множетели:1*2*5*5*7
Ответ:
3m-3n-5m-5n=3m-5m-3n-5n=-2m-(-2n)