exam Maths Puzzle Numerical Ability

How do you simplify completely this complex fraction?

[(a+1/a-1)+1 / (a+1/a-1)-1]^5

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exam Other Question

Please help me solve this equation:Add and simplify your answer
(6+5x+6x^2+8x^3)+ (3-5x+6x^2-8x^3) the measure of an angle is four times Find the measure of the angle.