Question 299097
cos (sin x) = 1
The answer is npi, n=o, plus or minus 1. plus or minus 2, etc.
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If cos(theta) = 1, theta = 0 radians
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Therefore sin(x) = 0 
x = 0+-2n(pi)   where n = 0,1,2...
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Cheers,
Stan H.