1.

If A+B+C=180^@" then " 4 cos""((pi-A)/(4)) cos""((pi-B)/(4)) cos""((pi-C)/(4))=

Answer»

`cos A + cos B + cos C `
`cos""(A)/(2) + cos""(B)/(2) + cos""(C)/(2) `
`SIN A + sin B + sin C `
`sin""(A)/(2)+sin"(B)/(2) + sin""(C)/(2) `

ANSWER :B


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