'`1-8 cos ^(2) theta + 8 cos ^(4) theta=`A)`sin 4 theta`B)`cos 4 theta`C)`sin ^(4) theta + cos ^(4)

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"`1-8 cos ^(2) theta + 8 cos ^(4) theta=`
A)`sin 4 theta`B)`cos 4 theta`C)`sin ^(4) theta + cos ^(4) theta`D)`sin ^(4) theta - cos ^(4) theta`"
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