1) f(x) = x - tg(-2x)
f " (x) = (x - tg(-2x) ) " = x " - tg " (-2x) = 1 + 2/cos^2 (-2x)
f " (0) = 1 + 2/cos^2 (-2*0) = 1 + 2/1 = 1 + 2 = 3
f " (pi) = 1 + 2/cos^2 (-2pi) = 1 + 2/1 = 1 + 2 = 3
2) f(x) = 2sin 2x - V2*x
f " (x) = (2sin 2x - V2*x) " = (2sin 2x) " - (V2*x) " = 2*2*cos 2x - V2*1 =
= 4cos 2x - V2.
f " (0) = 4cos 2*0 - V2 = 4*1 - V2 = 4 - V2.
3) f(x) = cos 2x
f " (x) = (cos 2x) " = -2*sin 2x
17+23=40
простая математика,2 класс
В первом случае площадь будет равна S=1/2*(20+12)*15=240
Во втором случае площадь будет равна S=1/2*(8+29)*8=148
(9 - 1 1/3 * 4 2/7) * 21/46 = 1 целая 1/2
1) 1 1/3 * 4 2/7 = 4/3 * 30/7 = (4*10)/(1*7) = 40/7 = 5 целых 5/7
2) 9 - 5 5/7 = 8 7/7 - 5 5/7 = 3 целых 2/7
3) 3 2/7 * 21/46 = 23/7 * 21/46 = (1*3)/(1*2) = 3/2 = 1 целая 1/2