(2cos∧2 a/2-1)-sin a)/根号2sin(a π/4)
=(cosa-sin a)/根号2sin(a π/4)
=根号2cos(a π/4)/根号2sin(a π/4)
=tan（a十π/4)
tan(π\4+a)=3,求(2cos^2 a\2-sina-1)\根号2sin(a+π\4)
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