Question

If x = a Cosθ, y = b sinθ, then b2x2 + a2y2 – a2b2 is equal to?

Answer 1

The answer is zero

first u square both sides on the two eqns

x = a Cosθ , y = b sinθ and but value of x2 and y2 in :

b2x2 + a2y2 – a2b2

and then take a2b2 common u will get the answer