Simplifying after applying quotient rule

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en bloc

Homework Statement

http://images.calcchat.com/solutionart/etf5e/03/c/se03c01047.png

What am i missing, because i get: 6/4 [(-1 + tanx*secx- (tanx)^2]

Last edited by a moderator: May 5, 2017

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ehild

Use that sin^2x+cos^x=1 in the third row .

ehild