SOLUTION: Find cos(x/2) if sinx=_3/4 and x is the third quadrant

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Question 1141668: Find cos(x/2) if sinx=_3/4 and x is the third quadrant
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+sin%28x%29+=+-3%2F4+
+x+=+arcsin%28+-3%2F4+%29+
+x+=+48.5904+%2B+180+
+x+=+228.5904+
+x%2F2+=+114.2952+
+cos%28+114.2952+%29+=+-.4114+
Note that +x%2F2+ is in the 2nd quadrant
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