1.

If A+B+C=180^(@) then cos A+cos B-cosC=

Answer»

`-1+4sinA//2sin B//2 SIN C//2`
`-1+4cosA//2cosB//2sinC//2`
`-1+4cosA//2cosB//2cosC//2`
`-1+4cosA//2sinB//2cosC//2`

ANSWER :B


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