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verify the indenty, use pythagorean identity to simplify

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Oct 17th, 2017

#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.



Mar 11th, 2015

thank you for help!! bless you.

Mar 11th, 2015

thank you for help!! bless you.

Mar 11th, 2015

thank you for help!! bless you.

Mar 11th, 2015

Your are very welcome. Thank you for your review.

Mar 17th, 2015

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