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The coordinates of the points on the cur...

The coordinates of the points on the curve `x=a(theta + sintheta), y=a(1-costheta)`, where tangent is inclined an angle `pi/4` to the `x`-axis are- (A) `(a, a)` (B) `(a(pi/2-1),a)` (C) `(a(pi/2+1),a)` (D) `(a,a(pi/2+1))`

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