Question 1065109
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Corrections to the solution by "MathTherapy"


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{{{sin (theta) = 1/sqrt(2)}}}
{{{sin (theta) = 1/sqrt(2) * sqrt(2)/sqrt(2)}}} ------ RATIONALIZING denominator
{{{sin (theta) = sqrt(2)/2}}}, which is: {{{highlight_green(matrix(4,5, -5pi/4, in, the, 2^(nd), quadrant,   
-7pi/4, in, the, 1^(st), quadrant, 
3pi/4, in, the, 2^(nd), quadrant, 
pi/4, in, the, 1^(st), quadrant))}}}


All these angles are in 1-st and the 2-nd quadrant.

No positive sine in the 3-rd and 4-th quadrant.
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