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3. The amount of force needed to keep a stationary object on a flat surface from moving is called static friction. If a book weighs p pounds and it is on a flat surface that is at an angle of 0 degrees, the coefficient of static friction c for the book is given by
cp cos 0 = p sin 0. Which of the following is an equivalent equation for c?
A c = sin O
B c = tan O
C c = cos e
Dc = cot 0