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Solve : (log)((-x^2-6x)//10)(sin3x+sinx)...

Solve : `(log)_((-x^2-6x)//10)(sin3x+sinx)=(log)_((-x^2-6x)//10)(sin2x)`

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`log(sin3x+sinx)/log((-x^2-6x)/10)=log(sin2x)/(log((-x^2-6x)/10)`
`sin3x+sinx=sin2x`
`2sin2x*cosx-sin2x=0`
`sin2x(2cosx-1)=0`
`sin2x=0`
`2x=0`
`cosx=1/2`
`sin3x+sinx>0`
...
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