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19. Given 15 cot A-8, nu sin A and sec A...

19. Given 15 cot A-8, nu sin A and sec A. 20. In figure, ABCD is a square of side 14 cm. With centres A, B, C and D, four circles are drawn such that each circle touch externally two of the remaining three circles. Find the area of the shaded region. 21. If AD and PM are medians of triangles ABC and PQR respectively, where AB AD

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