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OpenStudy (christos):
Use the coterminal theorem to evaluate cos420*
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OpenStudy (anonymous):
Cos(420) =Cos(420-360)=Cos(60) =1/2
OpenStudy (christos):
Why cos(60) = 1/2 where can I find that information
OpenStudy (anonymous):
on trig table or on calculator
OpenStudy (anonymous):
Best_mathematician please don't just copy my answer...
OpenStudy (anonymous):
oh sry ya he got it first but i didnt copy yours...dont blame and ya i dont want stupid medals give it to him
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