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sin(pi+x)^(2)-2*cos(240)-3*sin(7*pi/2)+cos(pi-x)^(2)=0

sin(pi+x)^(2)-2*cos(240)-3*sin(7*pi/2)+cos(pi-x)^(2)=0 equation

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The solution

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   2                             /7*pi\      2            
sin (pi + x) - 2*cos(240) - 3*sin|----| + cos (pi - x) = 0
                                 \ 2  /                   
$$\sin^{2}{\left(x + \pi \right)} + \cos^{2}{\left(- x + \pi \right)} - 2 \cos{\left(240 \right)} - 3 \sin{\left(\frac{7 \pi}{2} \right)} = 0$$
The graph
The graph
sin(pi+x)^(2)-2*cos(240)-3*sin(7*pi/2)+cos(pi-x)^(2)=0 equation