exam Maths Puzzle Numerical Ability

Simplify:

((x^(3/2))y^-3)^1/3
--------------------
((x^(1/2))y^-6)^-1

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exam Other Question

if secA=5/4,verify that 3sinA-4sin3A/4cos3A-3cosA If the line containing the points (-8,m) and (2,1) is parallel to the line containing the points (11,-1) and (7,m+1), what is the value of m?