Question

prove that sinx+cosx=cos(x-45)^4

Answer 1

sorry it is r\[\sqrt{2}\cos(x-45)^4\]

Answer 2

The power is on the entire cos term correct(not just the angle?) ie.
\[\cos^4(x-45)\]

Answer 3

cos(x-45) = cosxcos45 + sinxsin45 = 1/sqrt2 (cosx+sinx)
then sinx + cosx = sqrt2 cos (x-45)
don't have any power

Answer 4

and yeah like @Mathmuse said...

Answer 5

well i know that but can u prove it with explanation pls

Answer 6

I explained it lol

Answer 7

well you has to know first that cos(x-y) = cosxcosy + sinxsiny

Answer 8

hmm well its cos^4 , u proved it as cos only

Answer 9

well I think it should be only cos ...I think it's incorrect if it is cos^4

Answer 10

ok cool :D