Ask a New Question

Asked by Autumn

How do I go about proving that:
cos(4θ) + 4cos(2θ) ≡ 8cos^4(θ) - 3

Thanks in advance!
7 years ago

Answers

Answered by Steve
cos(4θ) = 2cos^2(2θ)-1 = 2(2cos^2(θ)-1)^2-1
4cos(2θ) = 4(2cos^2(θ)-1)
so, add them up
7 years ago
There are no AI answers yet. The ability to request AI answers is coming soon!

Submit Your Answer


We prioritize human answers over AI answers.

If you are human, and you can answer this question, please submit your answer.

Related Questions

this is for proving identies and its fustrating i can't solve this one question! lol x=feta (btw t... How might you go about proving that N-M is divisible by 9 when N represents an integer (such as 6923... How would I go about proving 1/log a +1/log a = 1/log base 100 a. Any help would be greatly appreci... i need help with proving five steps of l hospitals rule for (ex^2-1)/x I need help proving this identity 2sin^2x - 1 = sin^2x - cos^2x I need help proving this identity 1/cosx - cosx = sinxtanx I will be proving my answers with the textbook "World Studies: Western Hemisphere" Which U.S regi... I having difficulty in proving gods existence Geometry B U2 L3 Proving That a Quadrilateral Is a Parallelogram Answers 1. Complete this stateme... By proving,prove 1+4+7....+(3n-2) = n(3n-1)/2 using mathematical induction for n > or = 1
Submit Your Answer

Question

How do I go about proving that:
cos(4θ) + 4cos(2θ) ≡ 8cos^4(θ) - 3

Thanks in advance!

Ask a New Question
Archives Contact Us Privacy Policy Terms of Use