exam Maths Puzzle Numerical Ability

1-(1+xy^-2)^-2 divided by 1+(1+xy^-2)^-2

Directions are to simplify. Thanks

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exam Other Question

Find the vertices of a hyperbola with the equation (x + 3)^2 - 4(y - 2)^2 = 4
a. (-4, 2) and (-2, 2)
b. (-5, 2) and (-1, 2)
c. (4, -3) and (0, -3)
d. (3, -3) and (1, -3) If there are 17 different ingredients for a burrito, how many different combinations can be made? How many years would it take to try all the combinations?