Question

if
$x = a cos \alpha \\ y = bsin \alpha$
then find the value of
$a {}^{2}x {}^{2} + a {}^{2} y {}^{2}$
​

Answer 1

Step-by-step explanation:

a²( x²+y² )

a²(a²cos²A + b²sin²A)

a²(a²cos²A +b² -b²cos²A)

a²( (a²-b²)cos²A + b²)

a²(a²-b²)cos²A + a²b²

Answer 2

Answer:

a²( x²+y² )

a²(a²cos²A + b²sin²A)

a²(a²cos²A +b² -b²cos²A)

a²( (a²-b²)cos²A + b²)

a²(a²-b²)cos²A + a²b²

Step-by-step explanation:

Hope it's helpful to you :) :)