Thank you for your time...
I think that your question supposed to be sin(x)cos(x)=? for x=3/4π
sin3/4π=sqrt(2)/2
cos3/4π=-sqrt(2)/2
the equation sin(x)cos(x)=3/4π doesn't have a solution because 3/4π>1 !
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I think that your question supposed to be sin(x)cos(x)=? for x=3/4π
sin3/4π=sqrt(2)/2
cos3/4π=-sqrt(2)/2
the equation sin(x)cos(x)=3/4π doesn't have a solution because 3/4π>1 !