find cot(x ) if you are given that sin(x)=2/3 and that x is acute.
draw a rt. triangle with one angle as x (not the right angle)
choose the opp. side as 2 and hypotenuse as 3 so that the third side is
sqrt(5) (using pythagoras theorem)
so cot(x) = (sqrt 5) /2
some trigonometry formulae
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