Posted by
**Anonymous** on
.

Use the Pythagorean Identify to show that the double angle formula for cosine can be written as:

cos2x = 2cos^2x - 1

Sunday

March 26, 2017
Posted by
**Anonymous** on
.

Use the Pythagorean Identify to show that the double angle formula for cosine can be written as:

cos2x = 2cos^2x - 1

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