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Find the incorrect pair...

Find the incorrect pair

A

`(a)/(sin A ) = (b)/(sin B ) = (c )/(sin C)" "2R`

B

`(b^(2) + c^(2) - a^(2))/(2 bc) " = "`cos A

C

`(a - b)/(a + b) cot"" (c )/(2)" = "tan (A - B)/(2)`

D

`(a^(2) + c^(2) - b^(2))/(2ac)"= "` cos C

Text Solution

Verified by Experts

The correct Answer is:
A, B, C
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