exam Maths Puzzle Numerical Ability

Estimate the following sum 4 1/9 + 7 9/10 + 2 1/7 + 5 7/8

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exam Other Question

sin(x)cos(x)divided by Cos squared (x)-Sin squared (x) =Tan(x) divided by 1-Tan Squared (x)
Prove that the left is equal to the right show step by step left changed to right side 4X^3-XY^2