linda-murray_60c25436a43b1
linda-murray_60c25436a43b1
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cos(A+B)= cos(A)*cos(B) - sin(A)*sin(B), so, cos(alpha+(pi/3)) = cos(alpha)*cos(pi/3) - sin(alpha)*sin(pi/3) , and since cos(pi/3) = 1/2, sin(pi/3) = sqrt(3)/2, then, cos(alpha+(pi/3)) = 1/2 * cos(alpha) + sqrt(3)/2 *sin(alpha) = [cos(a…