SOLUTION: Prove using trig identities
cos3x=cos^3(x)-3sin^2(x)cos(x)
Thank you!
Algebra.Com
Question 1151362: Prove using trig identities
cos3x=cos^3(x)-3sin^2(x)cos(x)
Thank you!
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
use identity:
write as which is equal to
..........since and we have
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