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The value of 3(cos theta-sin theta)^(4)+...

The value of `3(cos theta-sin theta)^(4)+6(sin theta+cos theta)^(2)+4 sin^(6) theta` is where `theta in ((pi)/(4),(pi)/(2))` (a) `13-4cos^(4) theta` (b) `13-4cos^(6) theta` (c) `13-4cos^(6) theta+ 2 sin^(4) theta cos^(2) theta` (d) `13-4cos^(4) theta+ 2 sin^(4) theta cos^(2) theta`

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