exam Maths Puzzle Numerical Ability

I need to rewrite the expression with positive exponents.
1/2x^-2y^-3

Simplify the expression. The simplified expression should have no negative exponents.
(2x^3y^2/3xy)^-3

Please help!

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exam Other Question

We are supposed to factor polynomial. They say:
(x^2+y^2)^2-(y^2-z^2)^2 should equal (x^2+z^2)(x^2+2y^2-z^2).
HOW DO YOU SOLVE TAN(-3/4pi), sin(x-1/2pi), sin(5pi/3), tan(5pi/6), sin(pi-x)
tan(1/2pi-x), cos(4pi-x), cos(x+3/2pi), tan(x+1/2pi), sin(-2/3pi), cos{-5/4pi},
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