exam Maths Puzzle Numerical Ability

{(1,1),(1,-1),(2, -4), (3,9), (3,-9)is it a function and give the domain and range.

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exam Other Question

im stumped on these trig. problems. mainly because the worksheet their on doesnt say anything specific about what to do exactly. its really ambiguous:

1. 1/sin^2x = ? (has this (x-2x^1/2+1)^1/2 /1 - x+1/sqrtx-1