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In a triangle ABC if (a^(2) + b^(2))/(a^...

In a triangle ABC if `(a^(2) + b^(2))/(a^(2) - b^(2)) sin (A - B) = 1` and the triangle is not right angled, then `cos (A - B)` =

A

`sin (C/2 - pi/4)`

B

`cos (C/2 - pi/4)`

C

`tan(C/2 - pi/4)`

D

`cot (C/2 - pi/4)`

Text Solution

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The correct Answer is:
C
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