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OCW Scholar - Single Variable Calculus 20 Online
OpenStudy (anonymous):

If someone could explain how we get from Step 1 to Step 2 in 6c) from http://ocw.mit.edu/courses/mathematics/18-01sc-single-variable-calculus-fall-2010/exam-1/session-22-materials-for-exam-1/MIT18_01SCF10_exam1sol.pdf that would be very helpful.

OpenStudy (noelgreco):

6. Suppose that f satisfies the equation f(x + y)= f(x)+ f(y)+ x2y + xy2 for all real numbers x and y. They just substitute h for y.

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