sin(x)*cos(x)*tan(x)
(sin(x)*cos(x))*tan(x) при x = 3
(sin(x)*cos(x))*tan(x)
(sin((3))*cos((3)))*tan((3))
(sin(3)*cos(3))*tan(3)
cos(3)*sin(3)*tan(3)
cos(x)*sin(x)*tan(x)
2 sin (x)
1 cos(2*x) - - -------- 2 2
sin(2*x)*tan(x) --------------- 2