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If ((x)/(a) sin theta -(y)/(b) costheta...

If `((x)/(a) sin theta -(y)/(b) costheta )=1 and ((x)/(a)costheta +(y)/(b) sin theta)=1`, prove that `((x^(2))/(a^(2))+(y^(2))/(b^(2)))=2.`

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