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### Question

#### The normal of the curve given by the equation x = a (sin + cos), y = a (sin – cos) at the point Q is -

- (x + y) cos + (x – y) sin = 0
- (x + y) cos + (x – y) sin = a
- (x + y) cos – (x – y) sin = 0
- (x + y) cos – (x – y) sin = a

#### The correct answer is: (x + y) cos – (x – y) sin = 0

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