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OpenStudy (anonymous):
If cos(theta) = (-8/17) and sin(theta) = (-15/17) what quadrant is and cos(2theta)
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jimthompson5910 (jim_thompson5910):
have a look at this trig cheat sheet (with many formulas/identities you'll use in trig) http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf
jimthompson5910 (jim_thompson5910):
focus on the "double angle formulas"
OpenStudy (anonymous):
|dw:1399172276062:dw|
OpenStudy (anonymous):
Im still not understanding what quadrant its in
OpenStudy (anonymous):
I sont know that range for this
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jimthompson5910 (jim_thompson5910):
cosine is negative in quadrants II and III (ie when x is negative) |dw:1399172564464:dw|
jimthompson5910 (jim_thompson5910):
sine is negative in quadrants III and IV (when y is negative) |dw:1399172594724:dw|
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