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OpenStudy (amenah8):
FIND FAETA: cos faeta = (-15/17), sin faeta > 0
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OpenStudy (michele_laino):
do you mean cos(\theta) and sin(\theta), right?
OpenStudy (amenah8):
Right, sorry!
OpenStudy (michele_laino):
the requested angle \theta lies in the second quadrant, since we have this drawing: |dw:1439224267236:dw|
OpenStudy (michele_laino):
|dw:1439224370587:dw|
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