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OpenStudy (anonymous):
verify that is an indentity Sin(90 degree+A)=Cos A
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jimthompson5910 (jim_thompson5910):
Sin(90 degree+A)=Cos A sin(90+A) = cos(A) sin(90)cos(A) + cos(90)sin(A) = cos(A) (1)cos(A) + (0)sin(A) = cos(A) cos(A) = cos(A)
OpenStudy (anonymous):
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