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OpenStudy (anonymous):

I'm checking MIT maths course and I'm currently studying Implicit Differentiation and Inverse Functions (http://ocw.mit.edu/courses/mathematics/18-01sc-single-variable-calculus-fall-2010/part-b-implicit-differentiation-and-inverse-functions/session-15-implicit-differentiation-and-inverse-functions/). I don't understand one equation in "Worked Example". Why differentiation of squared y is equal to 2yy'? I can understand 2y but how this y' appears there?

OpenStudy (farmdawgnation):

Perhaps this is a question better asked in the Math group or in the OCW group related to that course?

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