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If : A+B+C=pi, "then" : 1-cos^(2) A-cos^...

If : `A+B+C=pi, "then" : 1-cos^(2) A-cos^(2)B-cos^(2)C=` A)`2 cos A * cos B * cos C ` B)`2 sin A * cos B * cos C` C)`2 cos A * sin B * cos C` D)`2 cos A * cos B * sin C`

A

`2 cos A * cos B * cos C `

B

`2 sin A * cos B * cos C`

C

`2 cos A * sin B * cos C`

D

`2 cos A * cos B * sin C`

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A
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