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Mathematics 11 Online
OpenStudy (anonymous):

compute cos(-pi/5) given... (Attached)

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?

OpenStudy (anonymous):

oh wait!. its the same amount neg and pos THANK YOU!

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