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if cos alpha + sin alpha = 3/4, then...

if ` cos alpha + sin alpha = 3/4`, then `sin ^6 alpha + cos ^6 alpha ` =

A

`(877)/(1024`

B

`(777)/(1024)`

C

`(878)/(1024)`

D

`(789)/(1024)`

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The correct Answer is:
A
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