exam Maths Puzzle Numerical Ability

Find the exact value of cot (-pie/6)

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exam Other Question

Find the mean and the median.
-6, -3, 1, 5, 9, 18 Divide and simplify rational expression 3x^2+7x-6 over 3x^2+x-2 divided by x^2+7x+12 over -4x^2-20x-16