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Solve 2 cos (w) + 7 cos(w) + 5 = 0 for all solutions. w=D .where k is any integer Preview Give your answer as an exact value

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COS a = -1 For any integer COS w = - 5 The range of cosine is 6 does ot -1<yI since 2 Fall in this range there is nO Solution2 cos Ca) +7 COs Ca)+5=0 Let cos C =OC a=2 C = +5 -bt 4ac 2a 2 C2) -7 +49-4O -719 IC = 7+3 -7-3 -10 -I - COS 2 cos w t5= 0 2

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