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The equation of the straight line passing through the point `(acos^3theta,asin^3theta)` and perpendicular to the line `xsectheta+ycos e ctheta=a` is (A) `xcostheta-ysintheta=acos2theta` (B) `xcostheta+ysintheta=acos2theta` (C) `xsintheta+ycostheta=acos2theta` (D) none of these

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