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OpenStudy (anonymous):
find the exact value of the given expression Cos(60*+315*)
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OpenStudy (anonymous):
it should be the same value as cos(15)
OpenStudy (anonymous):
cos (60+315) = cos(375)= cos(360+15)
OpenStudy (anonymous):
cos (15) = cos(45-30)
OpenStudy (anonymous):
use the formula cos (a-b)= cos a cos b - sin a sin b
OpenStudy (anonymous):
therefore, cos (15) = cos 45 cos 30 - sin 45 sin 30
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OpenStudy (anonymous):
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