Asked by rica

find sin s
when cot s= -1/3, s in quadrant 4

Answers

Answered by Reiny
If cot s= -1/3
then tan s = -3/1

construct a triangle, by Pythagoras, the hypotenuse is √10 , and in the 4th quad, the sine is negative, so
sin s = -3/√10
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