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What is the exact value for cos(-2[tex] \pi [/tex]/3)?
This should be done without a calculator.
Please explain the process if possible.

Respuesta :

notice the picture below

see where that angle is?

check your Unit Circle for that value

also notice, that fractions of [tex]\pi[/tex] are just like grabbing 180 degrees and splitting it, so one third of 180 or [tex]\pi[/tex] is 180/3 or 60 degrees
Ver imagen jdoe0001

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