<span>решите уравнение f'(x)=0 если f(x)=tg^2x</span>
1) ab(3a-b-a+2b) = ab(2a+b)2)mn(1-7n-1-7n) = -14mn^23) xy(10y-10+y) = xy(11y-10)<span>4)xz(5z-4x+1-5z) = xz(1-4x)</span>
<span>9x²-60x+100=0
(3х-10)</span>² = 0
(3х-10)·(3х-10) = 0
3х-10=0
3х = 10
х = 10 : 3
х = 3 ¹/₃