exam Maths Puzzle Numerical Ability

Let cos beta =a .Find the expression for cos 2beta and sin 2beta in terms of a
and hence confirm that - cos(square)2beta + sin(square)2beta = 1

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exam Other Question

solve the homogeneous system: {-3x+y_>=-6
-x+2y_>=8
X_>0 y_>0 The body mass index is a measure of the risk of heart disease. It is given by the following formula. I = 704.5W over H to the second power. Where W= weight in lbs and H = height in