Turn on thread page Beta
    • Thread Starter

    I need some help with trigonometry identities as I missed the lessons we had on them and I need to do some homework for it. Could someone please tell me how to do them with a walkthrough please(for just one question should be enough)? And the same for the proof question please. Thanks in advance

    Section B: Solve each equation in the range 0° ≤ x ≤ 360°. Give answers correct to 1 decimal place.
    13. 3−3cos𝑥=2sin^2𝑥
    18. sin 2x = - ½
    19. tan (2x+45) = 1.732

    23. Prove the following identity:
    (d) cos4𝜃−sin4𝜃≡cos2𝜃
The home of Results and Clearing


people online now


students helped last year

University open days

  1. SAE Institute
    Animation, Audio, Film, Games, Music, Business, Web Further education
    Thu, 16 Aug '18
  2. Bournemouth University
    Clearing Open Day Undergraduate
    Fri, 17 Aug '18
  3. University of Bolton
    Undergraduate Open Day Undergraduate
    Fri, 17 Aug '18
Will you be tempted to trade up and get out of your firm offer on results day?
Help with your A-levels

All the essentials

The adventure begins mug

Student life: what to expect

What it's really like going to uni


Essay expert

Learn to write like a pro with our ultimate essay guide.

Uni match

Uni match

Our tool will help you find the perfect course for you

Study planner

Create a study plan

Get your head around what you need to do and when with the study planner tool.

Study planner

Resources by subject

Everything from mind maps to class notes.

Hands typing

Degrees without fees

Discover more about degree-level apprenticeships.

A student doing homework

Study tips from A* students

Students who got top grades in their A-levels share their secrets

Study help links and info

Can you help? Study help unanswered threadsRules and posting guidelines

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