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Solve trig equations with unknowns both in and out trig functions?

Claudia Zara
Posted 7 years ago

Good morning everyone,

I'm new to the forum and a Wolfram beginner. I'm having troubles calculating trigonometric functions with unknowns both in and out of the brackets of trigonometric functions

eg: Cos[x] - x Sin[x]==0

I usually use Solve for polynomial equations, but neither Solve not Reduce can face these kind of problems enter image description here

Can someone please help me?

Thank You

POSTED BY: Claudia Zara
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Claudia Zara
Claudia Zara
Posted 7 years ago

Thank you very much to both of you for your answers, they will be precious.
POSTED BY: Claudia Zara
Attachments:
solution.nb
POSTED BY: Shenghui Yang

Try restricting the range of the variable:

Solve[Cos[x] - x*Sin[x] == 0 && Abs[x] < 10, x]
POSTED BY: Gianluca Gorni
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