SOLUTION: every time i try this problem: {{{dy/dx}}} {{{ 4/cos(x)}}} my answer is undefined

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Question 231659: every time i try this problem: dy%2Fdx +4%2Fcos%28x%29 my answer is undefined
Answer by kensson(21) About Me  (Show Source):
You can put this solution on YOUR website!
You can use the chain rule.
4+%28cos+x%29%5E%28-1%29 differentiates to 4+%28sin+x%29+%28cos+x%29%5E%28-2%29+=+4+tan+x+sec+x.