This has been bugging me all day. It seems like a very straight forward question but for whatever reason, I just cannot get my answer in the right format.
The question reads -
The parametric equations of a curve are
x = sin(2A) + 2sin(A)
y = cos(2A) - 2cos(A), where 0 < A < PI
Show that dy/dx = -(sinA) / (1 + cosA)
The differentiation is fine, I can do that without problems and I checked WolframAlpha to make sure I was correct in that but I just cannot simplify the dy/dx to the required format whatever I do. I keep getting very close in the different ways but never exactly what I need. I would be very grateful if someone could help.
Tip: You need to find dx/dA and dy/dA first then invert dx/dA and multiply them together to get to dy/dx