1.

If A+B+C=90^(@) then sin^(2)A+sin^(2)B+sin^(2)C=

Answer»

`1-2sin A sin B sin C`
`1+2 sin A sin B sin C`
`1+2 COS A cos B COSC`
`1-2cosA COSB cosC`

ANSWER :A


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