Join TSR now and get all your revision questions answeredSign up now
    • Thread Starter
    Offline

    2
    ReputationRep:
    How would I integrate Sin(x)Cos(2x)?
    Offline

    15
    ReputationRep:
    (Original post by Alex-Torres)
    How would I integrate Sin(x)Cos(2x)?
    Product to sum.

    Posted from TSR Mobile
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by majmuh24)
    Product to sum.

    Posted from TSR Mobile
    What does that mean, never heard of that method
    Offline

    15
    ReputationRep:
    (Original post by Alex-Torres)
    What does that mean, never heard of that method
    http://www.sosmath.com/trig/prodform/prodform.html

    Posted from TSR Mobile
    Offline

    16
    ReputationRep:
    (Original post by Alex-Torres)
    How would I integrate Sin(x)Cos(2x)?
    Factor formulae, have a look in the formula booklet
    • TSR Support Team
    • Very Important Poster
    • Reporter Team
    • Welcome Squad
    Offline

    19
    ReputationRep:
    (Original post by Alex-Torres)
    How would I integrate Sin(x)Cos(2x)?
    I would say that:
    \mathrm{cos2x=2cos^2x-1}

    \mathrm{sinxcos2x=sinx(2cos^2x-1)}

    \displaystyle \therefore \mathrm{I}=\int \mathrm{sinxcos2xdx= 2} \int \mathrm{sinxcos^2xdx} - \int \mathrm{ sinxdx}
    That's really simple.
 
 
 
Poll
Which web browser do you use?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.