SOLUTION: How do you rewrite the expression cos^2(2x) in terms of the first power of the cosine?
Algebra.Com
Question 1004892: How do you rewrite the expression cos^2(2x) in terms of the first power of the cosine?
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
Well cos(2x) = cos^2(x) - sin^2(x) = 2cos^2(x) - 1
and we will need to square that...so
cos^2(2x) = [2cos^2(x) - 1]^2 = 4cos^4(x) - 4cos^2(x) + 1
RELATED QUESTIONS
Use the formulas for lowering powers to rewrite the expression in terms of the first... (answered by Edwin McCravy)
Use the power-reducing formulas as many times as possible to rewrite the expression in... (answered by Boreal)
Use the power-reducing formulas as many times as possible to rewrite the expression in... (answered by charu91)
Need a better solution/explanation to: "Rewrite the expression sin^2(2x) in terms of the... (answered by lwsshak3)
Use the formulas for lowering powers to rewrite the expression in terms of the first... (answered by Alan3354)
Use a power reducing identity to rewrite the following expression below in terms... (answered by fcabanski)
Use the power-reducing formulas to rewrite each of the expressions in terms of the first... (answered by ikleyn)
Use the formulas for lowering powers to rewrite the expression in terms of the first... (answered by Alan3354)
Write in terms of sine and cosine:
cos^2 θ(tan^2 θ+1) =... (answered by stanbon)