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A-level maths help.
A(7, 2) and C(1, 4) are two vertices of a square ABCD. Find the equation of the diagonal BD? Divides the earth into eastern and Western Hemispheres? When solving a system of linear equations, there are three cases that may exist. What are those and when do they occur? The following exercise is based on the half-angle formulas. Use the fact that sin(π/6) = 1/2 to prove that tan(π/12) = 2 −sqrt 3.? Why is monatomic compound nonsense?