已知tan(π/4 -α)=-5/12,α∈(π/4 ,3π/4),
1个回答
cos(3π/2 +2β)=cos2(3π/4 +β)
sin(A+B)=-cos(π/2+A+B)=cos[(3π/4 +β)-(π/4 -α)]=-63/65
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