exam Maths Puzzle Numerical Ability

3x+2y=-2
2x-3z=1
0.4x-0.5z=-2.1

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exam Other Question

tan^2x-sin^2x= tan^2x sin^2x Please help.
Determine whether the following trinomial is a perfect square. If it is, factor the trinomial.
x^2 - 24x +48