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What is 50 as a percentage of 20?

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Answered by Luke C. • Maths tutor

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Consider an isosceles triangle ABC, where AB=AC=1, M is the midpoint of BC, and <BAM=<CAM=x. Use trigonometry to find an expression for BM and by finding BC^2, show that cos2x = 1 - 2(sinx)^2.

If we take a number and square it, the answer is also the product of the two numbers either side of it plus one. Prove algebraically that this works for all numbers.

Solve x^2 + 8x + 12 = 0

Solve (5-x)/2= 2x-7

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