Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    2
    ReputationRep:
    Q. show that cos(A-B)=cosAcosB+sinAsinB
    Offline

    2
    ReputationRep:
    I've never seen this before...?
    Offline

    12
    ReputationRep:
    Wow, best way to do this is probably to draw a triangle I guess. I haven't tried it myself though
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by unamed)
    I've never seen this before...?
    i got the question from my maths book ...i hope the examiners wont ask a gruesome question like this :/
    Offline

    2
    ReputationRep:
    (Original post by klgyal)
    i got the question from my maths book ...i hope the examiners wont ask a gruesome question like this :/
    I hope not. I think not.
    Offline

    0
    ReputationRep:
    'You won't be expected to derive these formulae from first principles' says the textbook.
 
 
 
  • See more of what you like on The Student Room

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

  • Poll
    Would you rather give up salt or pepper?
    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
  • See more of what you like on The Student Room

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

  • 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.