

A flag is hoisted on top of a building of height 7?3 m. A man of height ?3 m, standing on the ground, sees the top and bottom of the flag pole at 2 different angles of elevation that are found to be complementary. If the man is standing ?135 m away from the building, find the height of the flag pole.
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sin13π/6 = ?
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Given that cos x + cos y = 1, the range of sin x - sin y is
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The number of the real roots of the equation 2cos(x(x + 1)) = 2x + 2-x is
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