book Maths Puzzle Numerical Ability

Can you explain how to substitute cot (angle) with 1/root3

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book Other Question

{-2 < x < 9} I NEED HELP ASAP!

A motorboat traveled for 2 hous with an 8 KM/H. The return trip against the same current took 3 hours. Find the speed of the motorboat in still water.

THANKS IN ADVANCE