1.

If A+B+C=2S then cos^(2)S+cos^(2)(S-A)+cos^(2)(S-B)+cos^(2)(S-C)=

Answer»

`2sinA+cosBsinC`
`4 COS A//2 cos B//2 cos C//2`
`2+2cos A cos B cos C`
`SINA sinB`

Answer :C


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