Find sin(theta) if cos(theta) = 12/13 and theta is in quadrant 4

sin^2(theta) = 1 - cos^^2(theta) = 1 - (12/13)^2 = 1 - 144/169 = 25/169 so, sin(theta) = -5/13 since theta is in quadrant 4

Find the derivative of 3x^3-4x+2

9x^2-4

Find the domain of (x-4) divided by (x-2)(x+2) in interval notation.

(-infinity, -2) U (-2,2) U (2,infinity)