Question

find all points on the graph of r=2+costheta where tangent line is horizontal

Answer 1

what is the derivative of the given function?

Answer 2

i first found what y equals and then the derivative for that...(2+costheta)(costheta)+(isintheta(sintheta)

Answer 3

what is y ?

Answer 4

since for horizontal tangent y should be = to 0:)....y=(r*sin) or (2+cos)sin

Answer 5

you should not reduce the equation in the intial stages,

Answer 6

what should you do? my math book's example showed to find y= and take the derivative of that and set it equal to 0