What is the equation of the tangent line of #f(x) =cot^2x-tanx/(cos2x)# at #x=pi/8#?

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Answer 1 · 2016-10-09T19:37:06

At #x = pi/8, cos(2(pi/8)) = 0# which causes the second term to go to #oo#. Therefore, no tangent line.