Join TSR now and get all your revision questions answeredSign up now

[C2] Finding Cos of an angle from it's Sin fraction? Watch

    • Thread Starter
    Offline

    2
    ReputationRep:
    I'm really struggling with these questions, and can't find any help as to how to actually solve them (as in the method).

    Could anyone help me out please?

    Examples of questions -
    Name:  g405ltn.png
Views: 79
Size:  18.1 KB

    Thanks,
    Cameron.
    • TSR Support Team
    • Study Helper
    Offline

    20
    ReputationRep:
    (Original post by c3ntury)
    I'm really struggling with these questions, and can't find any help as to how to actually solve them (as in the method).

    Could anyone help me out please?

    Examples of questions -
    Name:  g405ltn.png
Views: 79
Size:  18.1 KB

    Thanks,
    Cameron.
    \displaystyle \sin^2 \theta + \cos^2 \theta\equiv1

    How can you use this to find \cos \theta given \sin \theta ?
    Offline

    1
    ReputationRep:
    The way i do is by using the Triangle .

    say Sin x = 12/13

    Sin of an angle : is opposite/Hypotenuse

    so it is 12 / 13

    now If you look for Cos x we need to use the triangle

    Look at the picture drawn to you.Name:  Untitled.png
Views: 58
Size:  8.0 KB
    Offline

    1
    ReputationRep:
    (Original post by charly2012)
    The way i do is by using the Triangle .

    say Sin x = 12/13

    Sin of an angle : is opposite/Hypotenuse

    so it is 12 / 13

    now If you look for Cos x we need to use the triangle

    Look at the picture drawn to you.Name:  Untitled.png
Views: 58
Size:  8.0 KB
    Just to add, if its acute the answer will be positive but obtuse means it depends on whether its sin or cos
 
 
 
Poll
Which Fantasy Franchise is the best?
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

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