`y = cos(x)/(1 - sin(x))` Differentiate.

goodthink | Student

Quotient Rule:

`y'=(((-sin(x))*(1-sin(x))-(-cos(x))(cos(x)))/((1-sin(x))^(2))) `

`y'=(((cos^(2)(x))+(sin(x))*(sin(x)-1))/((sin(x)-1)^(2)))`

This can simplify to 

`y' = 1/(1 - sin(x))`

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