For a math assessment we need to make a identical graph of $3\cos(4x)−5$ using $\sin$ instead of $\cos$? Wondering if anyone can find a formula using $\sin$?
Asked
Active
Viewed 56 times
0
-
3$\sin(x) = \cos(x - \frac{\pi}{2})$ – alkabary Jun 03 '15 at 01:57
-
Please do not delete your question as it might be useful for others, and you have an accepted answer already. – Jun 03 '15 at 08:48
1 Answers
1
$\sin(x) = \cos(x - \frac{\pi}{2})$ and so $\cos(x) = \sin(x + \frac{\pi}{2})$ and so $$3\cos(4x) - 5 = 3\sin(4x + \frac{\pi}{2})-5$$
Visually $\sin(x) = \cos(x - \frac{\pi}{2})$ means that $\sin$ graph is obtained by just shifting the graph of $\cos$ by $\frac{\pi}{2}$ to the right.
alkabary
- 6,214