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OpenStudy (anonymous):
cos theta+1=0
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OpenStudy (linn99123):
ALL odd multiples of pi cos(theta) +1 = 0 =>cos(theta)= -1=cos(pi) =>(theta)= 2n(pi)+pi n = 0,1,2,3,4.................................. =>(theta)= pi,3(pi),5(pi),7(pi).......................
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