Question: for the parametric equations given in x 2 ...
For the parametric equations given in x = 2 + 2 sin(2λ), y = 1 − cos(2λ) where − π /2 ≤ λ ≤ π/ 2 , determine if there are any horizontal or vertical tangents and find their location (make sure to verify these by calculating the derivative dy/dx). Additionally, calculate the equation to the tangent at λ = π/6.
Please explain where
4cos(2λ) = 0
becomes 2λ= π/2 + nπ