1.

If sinx+cosx=c, then sin^(6)x+cos^(6)x is equal to

Answer»

`(1+6c^(2)-3c^(4))/(16)`
`(1+6c^(2)-3c^(4))/(4)`
`(1+6c^(2)+3c^(4))/(16)`
`(1+6c^(2)+3c^(4))/(4)`

ANSWER :B


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