Sign up ×
Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required.

Does $\sin^2(4x) + \cos^2 (4x)=1$? So even $\sin^2 (249023049x) + \cos^2 (249023049x) = 1$?

share|cite|improve this question

2 Answers 2

Yes, it does. In fact, for every $x$ you have this identity $$ \cos(x)^2+\sin(x)^2=1 $$

share|cite|improve this answer
Got it. Thanks Gustavo! – Fomo Loco Apr 30 '13 at 21:57

Yes and yes (pretty quick, indeed).

share|cite|improve this answer
Yes indeed. Thank you again DonAntonio for the quick response! – Fomo Loco Apr 30 '13 at 21:57

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.