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OpenStudy (littlebird):
cos(x) = -1/2 for x
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OpenStudy (compassionate):
Cosine(x) = -1/2 So, basically, use your calculator in Rad and put in -1/2
OpenStudy (littlebird):
is there a way to do it without a calculator?
OpenStudy (compassionate):
unless you enjoy wasting 20 minutes of your life, yes.
OpenStudy (welshfella):
yes using the standard triangle
OpenStudy (welshfella):
- a standard triangle
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