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If (" cos " (A+B))/(" cos " (A-B)) =("...

If `(" cos " (A+B))/(" cos " (A-B)) =(" sin " (C+D))/(" sin " (C -D)) ,` prove that tan A tan B tan C + tan D=0

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To prove that \(\tan A \tan B \tan C + \tan D = 0\) given the equation \[ \frac{\cos(A+B)}{\cos(A-B)} = \frac{\sin(C+D)}{\sin(C-D)}, \] we will follow these steps: ...
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