Science

Math

Humanities

... and beyond

Socratic Meta
Featured Answers

Topics

Question #26ac4

1 Answer

Mar 17, 2017

See below

Explanation:

#cos2x=cos(x+x)=cosxcosx-sinxsinx=cos^2x-sin^2x#

#therefore cos2x=cos^2x-sin^2x# ΟΕΔ/#QED"#

Related questions

See all questions in Double Angle Identities

Impact of this question

1448 views around the world

You can reuse this answer
Creative Commons License