SOLUTION: Prove: Cos4x = 8Cos^4(x) - 8Cos^2(x) + 1 Thank you in advance

Question 927208: Prove:
Cos4x = 8Cos^4(x) - 8Cos^2(x) + 1
Thank you in advance
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
to prove , start with right side

=

=

= .........substitute

=

=

= .................substitute

=

= ..............substitute

=

=

=

= ...we came to the left side

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