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The radius of the circle whose equation ...

The radius of the circle whose equation in parametric form is `P(theta)=(acostheta+bsintheta,asintheta-bcostheta),` is : `(a+b)/2` (b) `sqrt(a b)` `sqrt(a^2+b^2)` (d) `(a b)/(a+b)`

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If btantheta=a , the value of (asintheta-bcostheta)/(asintheta+bcostheta) (a) (a-b)/(a^2+b^2) (b) (a+b)/(a^2+b^2) (c) (a^2+b^2)/(a^2-b^2) (d) (a^2-b^2)/(a^2+b^2)

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