book Maths Puzzle Numerical Ability

k=-2(-2-2)
=-2(-4)
k=8

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book Other Question

Can you explain how to substitute cot (angle) with 1/root3 I cant figure out how to divide a monomial by a monomial. Im stuck on these three problems.
Numbers in < > represent exponents

(5n<5>p)<0> / (n<3>p)<2>=

3(a<2>b)4 / (3ab)