How to find cos2theta

asked Jun 20, 2018 43.9k views

2 votes

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6 votes

These are the double angle formulas. What the other person mentioned above is the sum and difference formula.

Trickbz answered Jun 21, 2018

8.1k points

4 votes

You can use the sum and difference identities which for cosine is cos(a+b)= cosacosb-sinasinb

Rooz answered Jun 26, 2018

by Rooz

7.6k points

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