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How do we prove this?

How do we prove this?
asked 90.5k views
5 votes
How do we prove this?

How do we prove this?-example-1
asked
User Ashik Meerankutty
by
8.2k points

1 Answer

2 votes
cos(x+2x) + cosxcos2x - sinxsin2x
answered
User Roberto Attias
by
8.2k points
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