Question 1067582
<pre>
The word is "solve", not "slove" :)

{{{sin(X)+sin(3X)+sin(5X)}}}{{{""=""}}}{{{0}}}

Write X as 3X-2X and 5X as 3X+2X

{{{sin(3X-2X)+sin(3X)+sin(3X+2X)}}}{{{""=""}}}{{{0}}}

Then use the formulas for sin(A-B) and sin(A+B).
Some terms will cancel.  Then you'll be able to factor 
out sin(3X), and solve.

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do not charge any money ever.

Edwin</pre>