If \[\tan A=\frac{1}{2},\tan B=\frac{1}{3},\]then \[\cos 2A=\] [CET 1989]

If \[\tan A=\frac{1}{2},\tan B=\frac{1}{3},\]then \[\cos 2A=\] [CET 19

1.	If \[\tan A=\frac{1}{2},\tan B=\frac{1}{3},\]then \[\cos 2A=\] [CET 1989]
A.	\[\sin B\]
B.	\[\sin 2B\]
C.	\[\sin 3B\]
D.	None of these
Answer» C. \[\sin 3B\]

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If \[\tan A=\frac{1}{2},\tan B=\frac{1}{3},\]then \[\cos 2A=\] [CET 1989]

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