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If cos(A+B)sin(C-D)="cos"(A-B)"sin"(C+D)...

If `cos(A+B)sin(C-D)="cos"(A-B)"sin"(C+D)` , then write the value of `t a n A t a n B t a n Cdot`

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cos(A-D)sin(B-C)+cos(B-D)sin(C-A)+cos(C-D)sin(A-B)=0