Turn on thread page Beta
    • Thread Starter
    Offline

    6
    ReputationRep:
    Solve (1+cosx)^2=1/2 for -180 <x <180
    • Community Assistant
    Offline

    15
    ReputationRep:
    Community Assistant
    (Original post by ramshahk)
    Solve (1+cosx)^2=1/2 for -180 <x <180
    How would you isolate the cosx term?
    • Thread Starter
    Offline

    6
    ReputationRep:
    (Original post by an_atheist)
    How would you isolate the cosx term?
    Square root it? Im not sure
    • Community Assistant
    Offline

    15
    ReputationRep:
    Community Assistant
    (Original post by ramshahk)
    Square root it? Im not sure
    Yes. You square root it.
    • Thread Starter
    Offline

    6
    ReputationRep:
    (Original post by an_atheist)
    Yes. You square root it.
    Then
    • Community Assistant
    Offline

    15
    ReputationRep:
    Community Assistant
    (Original post by ramshahk)
    Then
    What do you think? Write it out.
    • Thread Starter
    Offline

    6
    ReputationRep:
    (Original post by an_atheist)
    What do you think? Write it out.
    Yes I've done that
    • Community Assistant
    Offline

    15
    ReputationRep:
    Community Assistant
    (Original post by ramshahk)
    Yes I've done that
    And what are you left with?
    • Thread Starter
    Offline

    6
    ReputationRep:
    (Original post by an_atheist)
    And what are you left with?
    1+cos= square root 1/2
    • Community Assistant
    Offline

    15
    ReputationRep:
    Community Assistant
    (Original post by ramshahk)
    1+cos= square root 1/2
    And how do you isolate cosx from there?
    Offline

    0
    ReputationRep:
    I would expand the bracket, then bring the 1/2 to the other side and put the equation =0. You then have a quadratic to solve
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: February 8, 2017
Poll
Do you think parents should charge rent?
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

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