# How do I do Implicit Differentiation ? And Tangent Lines?

Dear Joe 1) To do Implicit Differentiation , go to 3 Derivatives , then go to Implicit Differentation. Now enter your equation : important is to use * whenever multiplying x and y. So write 3*x*y instead of 3xy . Altogether: x^2 + 3*x*y +y^2 = 11 and below find its derivative. 2) To find… (read more)