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February 14, 2016
Posted by **Molly** on Thursday, February 28, 2013 at 3:08pm.

x cos y + y cos x = 1

- calculus -
**Steve**, Thursday, February 28, 2013 at 3:25pmjust use the product rule and go for it:

cosy - x siny y' + y' cosx - y sinx = 0

y'(cosx - x siny) = y sinx - cosy

y' = (y sinx - cosy) / (cosx - x siny)