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Convert x^2-y^2=4 into a polar equati...

Convert `x^2-y^2=4` into a polar equation.

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`x^2-y^2=4`
or `(rcostheta)^2-(rsintheta)^2=4`
or `r^2cos^2theta-r^2sin^2theta=4`
or `r^2(cos^2theta-sin^2theta)=4`
or `r^2cos2theta=4`
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