In a triangle \[ABC\], \[\tan \frac{A}{2}=\frac{5}{6}\] and \[\tan \fr – McqOptions

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1.	In a triangle \[ABC\], \[\tan \frac{A}{2}=\frac{5}{6}\] and \[\tan \frac{C}{2}=\frac{2}{5},\] then[EAMCET 1994]
A.	\[a,\ b,\ c\]are in A.P.
B.	\[\cos A,\ \cos B,\ \cos C\]are in A.P.
C.	\[\sin A,\ \sin B,\ \sin C\]are in A.P.
D.	(a) and (c) both
Answer» E.

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