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There are two sets of parallel line thier equation being x cos a + y sin a = p and x sina - ycosa = p;p = 1, 2, 3.., n and $$\propto \in \left( 0,\dfrac { \pi }{ 2 } \right) $$. If the number of rectangles formed by these two sets of lines is 225, then the value of n is equals to

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