SOLUTION: Solve ; sin(x) sin(2x) < sin(3x) sin(4x)

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Question 1159950: Solve ;
sin(x) sin(2x) < sin(3x) sin(4x)
Found 3 solutions by MowMow, Alan3354, ikleyn:
Answer by MowMow(42)   (Show Source): You can put this solution on YOUR website!
I worked it out with substitutions and found that sin(x) sin(2x) is never less than sin(3x) sin(4x), but they are equal when x = 0.
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
Solve ;
sin(x) sin(2x) < sin(3x) sin(4x)
==============
I disagree with the other tutor.
The inequality is true for x = 18 degs (for 1 example)
More on it later.
Answer by ikleyn(52786)   (Show Source): You can put this solution on YOUR website!
.

I am not going to solve; I only want to plot. 

    


    Plot y =  sin(x)*sin(2x) (red) and y = sin(3x)*sin(4x)  (green)

You are interested to find where the green line is above the red line.



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