Results are out! Find what you Get quick advice or join the chat
Hey! Sign in to get help with your study questionsNew here? Join for free to post

C3 Trig Identities

Announcements Posted on
  1. Offline


    7B) Unsure on the last stage of this question as I'm left with:


    to get to Sec^2x=25

  2. Offline

    cosec^2x = 1 + cot^2x

    so you have -2(1+cot^2x)/-cot^2x=50

    You can get rid of the negatives as they are on both the top and bottom


    The sin^2x cancel out to give you:
    2 x1/cos^2x=50
    therefore... 2sec^2x=50

    Hope that makes sense

    EDIT: You could also go from
    2cosec^2x/cot^2x to 2(1/sin^2x)/cos^2x/sin^2x


Submit reply


Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: May 25, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Today on TSR
Do you write or type when taking notes in class?
Useful resources

Make your revision easier


Maths Forum posting guidelines

Not sure where to post? Read here first


How to use LaTax

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