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

    1
    ReputationRep:
    Hey again guys,

    I need to solve sin(x+30) = 2cos(x+45)

    I'm thinking that to simplify this, I should use compound angle formula on the sin function and the cos function. Is this the right way to go about solving it, or should I be using R,A formula. And why?

    Thanks
    Offline

    1
    ReputationRep:
    You can use either or because both can independently be derived from the other.

    Given that, I would use compound angle because I find evaluating sine and cosine (even if it's both) easier than evaluating tangent, and you don't have to go around finding the coefficients a and b.
 
 
 
Poll
If you won £30,000, which of these would you spend it on?
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.