Results 1 to 3 of 3
Like Tree2Likes
  • 1 Post By fan96
  • 1 Post By Ted_

Thread: help with further trig question

  1. #1
    New Member
    Join Date
    Mar 2018
    HSC
    N/A
    Gender
    Male
    Posts
    12
    Rep Power
    1

    help with further trig question

    Hey how would this question be solved?

    sin(A + B - C) cos(A - B + C) + cos (A + B - C) sin(A - B + C)
    HSC 2019
    Extension 1 Mathemathics - Standard English - Engineering Sudies - Economics - Business Studies
    ATAR Aim: 92+
    Desired Course: Computer Science at UNSW

  2. #2
    617 pages fan96's Avatar
    Join Date
    May 2017
    HSC
    2018
    Gender
    Male
    Location
    NSW
    Posts
    322
    Rep Power
    1

    Re: help with further trig question

    Use the angle sum identity:


  3. #3
    New Member
    Join Date
    Jun 2017
    HSC
    2018
    Gender
    Male
    Location
    Greenacre
    Posts
    8
    Rep Power
    1

    Re: help with further trig question

    sin(a + b) = sin(a)cos(b) + cos(b)sin(a)

    Similarly:

    sin(A + B - C)cos(A - B + C) + cos(A + B - C)sin(A - B + C) = sin[(A + B - C)+(A - B + C)]
    = sin(2A)

    Here's the answer, little late sorry
    2018 Marks so far: English Advanced (83.33), Mathematics (90), Mathematics Extension 1 (85), Physics (92.86), Chemistry (-), Business Studies (92.5), SOR I (80)

    2018 HSC Goals:
    English Advanced (87), Mathematics (98), Mathematics Extension 1 (96), Physics (93), Chemistry (90+), Business Studies (90), SOR I (80)

    ATAR AIM: 97+
    Current ATAR (Matrix ATAR Calculator): 96.00

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •