If \[\sin A\,(60{}^\circ -A)\,\sin (60{}^\circ +A)=k\sin 3A,\] then what is k equal to?

If \[\sin A\,(60{}^\circ -A)\,\sin (60{}^\circ +A)=k\sin 3A,\] then wh

1.	If \[\sin A\,(60{}^\circ -A)\,\sin (60{}^\circ +A)=k\sin 3A,\] then what is k equal to?
A.	\[1/4\]
B.	\[1/2\]
C.	\[1\]
D.	\[4\]
Answer» B. \[1/2\]

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If \[\sin A\,(60{}^\circ -A)\,\sin (60{}^\circ +A)=k\sin 3A,\] then what is k equal to?

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