\f15. Find the derivative of the following: a. f(x) =sin(2x) +4cos(3x) + 2 tan(5x) b. f(x) = 2 tan(x2) + 5sec(3x) + csc(4x) c. f(x) =5tan(3x) + cos(x2) d. f(x) =5x2 sin(9x). \" 4 21.Gtven: .I'J-Ay+y =37: . (it it Find 41. nit" b. Find the equation of the tangent line to the curve at (32.). (Show work; hint: you need to use implicit differentiation!) 19. Given f(x) = Vx- +10x + 26 ; find the x-coordinates of points where the tangent line is horizontal.1/5 18. Given f(x) = (x-6x ; find the x-coordinates of points where the tangent line is horizontal.