Answer:

Step-by-step explanation:

x=acos³∅

x/a = cos³∅

[tex](x/a)^2^/^3 =[/tex] (cos³∅)[tex]^2^/^3[/tex]

[tex](x/a)^2^/^3 = cos^2[/tex]∅

Similarly

[tex](y/b)^2^/^3 = sin^2[/tex]∅

Adding

[tex](x/a)^2^/^3 + (y/b)^2^/^3 =[/tex] sin²∅ + cos²∅ = 1