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OpenStudy (anonymous):
Find cos if sin=-5/13
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OpenStudy (cwrw238):
|dw:1373388575423:dw|
OpenStudy (anonymous):
so if cos is c=a/h, then . . . cos=-12/13?
OpenStudy (cwrw238):
yes
OpenStudy (anonymous):
Awesome thanks!
OpenStudy (cwrw238):
yw
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OpenStudy (cwrw238):
13-12-5 is one of the 'whole number' triangles which fit the pythagoras theorem
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