Question

x=a(sintheta + Cos theta) and y=b (sintheta - cosTheta) then x²/a²+y²/b²=?

Answer 1

Hope this helps you.

Answer 2

x^2/a^2+y^2/b^2=(sin theta + cos theta)^2+(sin theta - cos theta)^2= 2*(sin^2 theta  + cos^2 theta)= 2*1=2