Science

Math

Humanities

... and beyond

Socratic Meta
Featured Answers

Topics

Question #6e4bb

1 Answer

Jan 13, 2018

#4cos(20)#

Explanation:

Given #4-8sin^2(10)#

factor 4 out of both terms:

#4(1-2sin^2(10))#

Use the identity that #cos(2x)=1-2sin^2(x)#:

#4cos(2(10)) = 4cos(20)#

Related questions

Impact of this question

780 views around the world

You can reuse this answer
Creative Commons License