User Portlet
| Discussions |
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| I used f[x_] = (x^3 + 2 x^2 + 15 x + x)*Sin[ Pi* x]; Derivative [1][f] gave a wrong answer. The Derivative of Sin x is Cos x NOT zero. What is wrong? |
User Portlet | Discussions |
|---|
| I used f[x_] = (x^3 + 2 x^2 + 15 x + x)*Sin[ Pi* x]; Derivative [1][f] gave a wrong answer. The Derivative of Sin x is Cos x NOT zero. What is wrong? |