exam Maths Puzzle Numerical Ability

Can you please help me with this problem: tan^2θ-sin^2θ / tan^2θsin^2θ

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exam Other Question

Solve the following system of equations by using the inverse of the coefficient matrix A. (AX=B)

-2x-y+6z=-23
-3y+8z=-35
-3x+2y+5z=-15 3 brothers dispose a sum of money to the banque.The first one disposes 1/2 of his sum,le second 2/5 of his sum and the third 3/10.After that the first one takes 2/3 of his sum, th