exam Maths Puzzle Numerical Ability

How do you solve this radical? This is a fraction. Radical twenty in the numerator over sixteen as the denominator.
Thank you.

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exam Other Question

I am a grade 10 students and i like trigonometry but i found this quiet tough.Plz can u solve it for me..
prove that (sec4a-1)/(sec8a-1)=tan4a/tan2a 6x^2y^3 + 9x^2y^3
3x^2y^2

can you help me solve this