1) а) х=-П/2 + 2Пn
б)х=+-П/4 + 2Пn
в)(если -корень3) х= -П/3 + Пn
2) cos=-1 x=П+2пn
б) -?
3) а)tgx=-1 x=-П/4+Пn
б)3tg^2x-2корень3tgx+1=0
x=П/6+Пn
4) а)х=+-2П/3 +2Пn
б)х=(-1)^n * arcsin1/4 +Пn
в) х=arctg2 + Пn
5)а)tgx=2 х=arctg2 + Пn
б)х=arctg2 + Пn
F' = (sin'(5x)*sin(3x) + sin(5x)*sin'(3x)) + (cos'(5x)*cos(3x) + cos(5x)*cos'(3x)) = 5*cos(5x)*sin(3x) + 3cos(3x)*sin(5x) - 5sin(5x)*cos(3x) - 3sin(3x)*cos(5x) = 2sin(3x)*cos(5x) - 2sin(5x)*cos(3x) = 2*(sin(3x)*cos(5x) - sin(5x)*cos(3x)) = 2sin(3x-5x) = 2sin(-2x) = -2sin(2x)
5x+4x-6x^2=15x-6x^2-12
5x+4x-15x=-12
-6x=-12
x=2
An=a1+(n-1)d=a1+(n-1)12=a1+12n-12=-15 a1=-3-12n Sn=(a1+an)n/2=(-3-12n-15)n/2=(-12n-18)n/2=(-6n-9)n=-6n^2-9n -6n^2-9n=-456 6n^2+9n-456=0 2n^2+3n-152=0 D=9+1216=1225 n=(-3+35)/4=32/4=8