Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing

This Question is Closed

sirm3dBest ResponseYou've already chosen the best response.0
do you know the reduction formula for \[\int \cos^n x \,\mathrm dx\]
 one year ago

matrickedBest ResponseYou've already chosen the best response.1
first simplify cos^3 x in terms of cosine of 3x and x and then integrate by parts
 one year ago

matrickedBest ResponseYou've already chosen the best response.1
i don't think here u should use reduction formula
 one year ago

bii17Best ResponseYou've already chosen the best response.0
its \[\cos ^3 x\] .. where did u get 3x and x @matricked
 one year ago

matrickedBest ResponseYou've already chosen the best response.1
use cos3x =4 cos^3 (x)  3cos x
 one year ago

sirm3dBest ResponseYou've already chosen the best response.0
why not? it solves the problem too, but the solution may not be attractive to @bii17
 one year ago

matrickedBest ResponseYou've already chosen the best response.1
i mean use cos^3 (x) =1/4 *(cos3x +3cosx)
 one year ago

bii17Best ResponseYou've already chosen the best response.0
oh okay.. then what will happen next ? @matricked
 one year ago

matrickedBest ResponseYou've already chosen the best response.1
and then use by parts
 one year ago

bii17Best ResponseYou've already chosen the best response.0
\[1/4 [x(\cos 3x + 3\cos x)]dx\] is this correct? @matricked
 one year ago

bii17Best ResponseYou've already chosen the best response.0
so there will be u and du den dv and v... i used Dv as cos 3x dx the V will be 1/3 sin 3x ???
 one year ago

matrickedBest ResponseYou've already chosen the best response.1
for both integration of 1/4 *xcos3x take x as the first function
 one year ago

bii17Best ResponseYou've already chosen the best response.0
i get it.. thanks a lot :) @matricked
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.