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OpenStudy (anonymous):
cos(65degrees) = sqrt ( (1 + cos(130 degrees) /2) ) true or false
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OpenStudy (nubeer):
try using calculator to get answer.. and see if left side answer is equal to right side or not.
OpenStudy (anonymous):
half angle
OpenStudy (anonymous):
OpenStudy (anonymous):
so it is true
OpenStudy (anonymous):
well It was a pleasure to help you saludos desde Perú
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