3.cos-1(x^2-7x+25/2)=π
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x^2-7x+25/2=-1
x^2-7x+27/2=0
2x^2-14x+27=0
now you may do it....
x^2-7x+27/2=0
2x^2-14x+27=0
now you may do it....
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