The graph of y = cos x ln cos 2 x has seven horizontal tangent lines
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The graph of y = cos x • ln cos2 x has seven horizontal tangent lines on the interval [0, 2π]. Find the approximate x-coordinates of all points at which these tangent lines occur.
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Related Book For
Calculus Early Transcendentals
ISBN: 978-0321947345
2nd edition
Authors: William L. Briggs, Lyle Cochran, Bernard Gillett
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