Question 1159218
x^2/SQRT(a^2 + a^2Tan^2θ)
x^2/SQRT(a^2(1+Tan^2θ)) = x^2/SQRT(a^2Sec^2(θ)) = a^2Tan^2θ /(a^2Sec^2θ)
= aTan^2θ/Secθ = aSin^2θ(Cosθ)/Cos^2θ) = aSin^2θ/Cosθ