Find `theta`

x = h + aCos`theta`
y = k + b Sin`theta`

Eliminate theta from a sin theta + bcos theta = x "and" a cos theta -b sin theta = y

If xcos theta- y sin theta =a, x sin theta + y cos theta = b , prove that: x^(2) + y^(2) = a^(2) + b^(2) .

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

If x=a sin theta+b cos theta and y=a cos theta -b sin theta, " prove that " x^(2)+y^(2)=a^(2)+b^(2).

Eliminate theta from the equation , a=x sin theta-y cos theta and b= x cos theta + y sin theta .