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OpenStudy (anonymous):
Helpful steps please,Find cos(s+t) cos s=1/3, s in quadrant I and sin= -1/2, t in quadrant IV.? So far I have tried it and have found sin s= 2sqrt(2)/3 and cos t= sqrt(3)/2. when I did cos(s+t) I did cos (s)(t)= 2sqrt(2)/6 sin (s)(t)= -sqrt(3)/4 I am stuck from here.
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