If \( \cos (A+B)=0 \), then the value of \( \sin (A-B) \) is:
a. \( \cos \mathrm{A} \)
b. \( \co... VIDEO
If \( \cos (A+B)=0 \), then the value of \( \sin (A-B) \) is:
a. \( \cos \mathrm{A} \)
b. \( \cos 2 \mathrm{~B} \)
c. \( \sin \mathrm{A} \)
d. \( \cos 2 \mathrm{~A} \)
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