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OpenStudy (anonymous):
compute cos(-pi/5) given... (Attached)
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OpenStudy (anonymous):
i got 0.588 and 1.286 but it says its wrong idk what i should do , arenti plugging in ?
OpenStudy (anonymous):
if you use the identity cos(-x) = cos(x)
OpenStudy (anonymous):
-0.809 isnt the answer either
OpenStudy (anonymous):
it's should be +0.809
OpenStudy (anonymous):
what? but doesnt it ask for -pi/5?
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OpenStudy (anonymous):
oh wait!. its the same amount neg and pos THANK YOU!
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