hey, i have a couple of questions!
1. A triangle has its vertices at A(-1,3), B(3,6), and C(-4,4). Show that, to three significant figures, cosB(angle A)C = -0.569.
2. The function f is given by f(x) = 2sin(5x-3).
(a) find f"(x)
(b) write down f(x)dx
3. There is a cube, OABCDEFG, wehre the length of each edge is 5 cm. Express the following vectors in terms of i, j, and k.
(a) vector OG
b) vector BD
(c) vector EB
thats all, thanks