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## f(x) := x.cos(x) - sin(x) . Plotting local max-min-points ?  19-Tanzanite

## f(x) := x.cos(x) - sin(x) . Plotting local max-min-points ?

Hello Everyone.

f(x) := x.cos(x) - sin(x) . Plotting local max-min-points ? Regards.

1 ACCEPTED SOLUTION

Accepted Solutions  24-Ruby V
(To:lvl107)

You expect different answers than here

ore here

?

Put your math together! You have to find the zeros of the first derivative. Either symbolically or numerically. You have all the tools necessary at hand!

Simply exclude those where the second derivative is zero, too. To be mathematically more precise you should exclude those where the first derivative with non-zero value is of an odd degree.

2 REPLIES 2  19-Tanzanite
(To:lvl107)

And : x.cos(x) - sin(x) solve, x ==> 10 solutions.

Regards.  24-Ruby V
(To:lvl107)

You expect different answers than here

ore here 