What is the general equation of the ellipse that is not in the origin and rotated by an angle?

I have the equation not in the center, i.e.


But what will be the equation once it is rotated?


After a lot of mistakes I finally got the correct equation for my problem:-

$$\dfrac {((x-h)\cos(A)+(y-k)\sin(A))^2}{a^2}+\dfrac{((x-h) \sin(A)-(y-k) \cos(A))^2}{b^2}=1,$$

where $h, k$ and $a, b$ are the shifts and semi-axis in the $x$ and $y$ directions respectively and $A$ is the angle measured from $x$ axis.

Source : Link , Question Author : andikat dennis , Answer Author :
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