could anyone check that for me plz

[moham_87]

Hiiiiiiiiiii everyone
I've these two waves
y1=3sin(kx-wt)
y2=4cos(kx+wt)
I need to find the resultant wave (y1+y2)
I got that answer:

y= 7 cos(wt+45) sin(kx+45)
is that right?? plz if not give me a hint

bye bye

[HallsofIvy]

How about giving us some ideas as to HOW you got that and why you think it might be right.

[moham_87]

I added the amplidtude mathematically
then using trigonometric rules i added the two "sin" and "cos" functions

sin(a)+sin(b)=sin((a-b)/2)cos((a+b)/2)....or something like that

BYE BYE...i still need to know if my answer is true

bYYyYyyyYYyYYyYE