#4. 4 cos^2 theta - 4 sin^2 theta = 4 cos^2 theta - 4 (1 - cos^2 theta) =
4 cos^2 theta - 4 + 4 cos^2 theta = 8 cos^2 theta - 4 Put cos^2 theta in the box.
thank you for help!! bless you.
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