Two circles of radius R and r, where the circle with radius r having a fixed point roll inside the circle with radius R along its circumference forming hypocycloid. What is the equation of epicycloid in Y(θ)?

• A. Y(θ) = (R+r)sin(θ)-rsin(\(\frac{R+r}{r}\) θ)
• B. Y(θ) = (R+r)cos(θ)+rsin(\(\frac{R+r}{r}\) θ)
• C. Y(θ) = (R-r)sin(θ)-rsin(\(\frac{R-r}{r}\) θ)
• D. Y(θ) = (R+r)cos(θ)+rsin(\(\frac{R-r}{r}\) θ)