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

Question

1034 views around the world

You can reuse this answer
Creative Commons License

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.