# how do i integrate...

Watch
Announcements
This discussion is closed.
#1
1. integrate cos(m.pi.x/L)cos(n.pi.x/L) between L and -L

and same integration but with sin insted of cos

2. integrate sin(m.pi.x/L)cos(n.pi.x/L) between L and -L and show it equals 0
0
15 years ago
#2
1. integrate cos(m.pi.x/L)cos(n.pi.x/L) between L and -L

and same integration but with sin insted of cos

2. integrate sin(m.pi.x/L)cos(n.pi.x/L) between L and -L and show it equals 0
For one use the identity

2 cosP cosQ = cos(P+Q) + cos (P-Q)

for suitable P and Q.

For the second one, determine a similar identity using

sin(P+Q) + sin (P-Q).
0
X
new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### What are you most likely to do if you don't get the grades you were expecting?

Go through Clearing (66)
41.77%
Take autumn exams (54)
34.18%
Look for a job (4)
2.53%
Consider an apprenticeship (4)
2.53%
Take a year out (21)
13.29%
Something else (let us know in the thread!) (9)
5.7%