book Maths Puzzle Numerical Ability

how do you evaluate the function: cot(4pi/3)

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book Other Question

If the two-digit integers M and N are positive and have the same digits, but in reverse order, which of the following CANNOT be the sum of M and N ?
(A) 181
(B) 163
(C) 121
(D) 99
(E) 44 if i am expecting $1,716,000 but earned $7,093,000 in terms of % how much did i exceed my expectations by?