Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta

Trigonometry--identity proof question,help watch

    • Thread Starter
    Offline

    10
    ReputationRep:
    need help plz for Q)10 part b and c
    Attached Images
     
    Offline

    22
    ReputationRep:
    (Original post by lil_jack)
    need help plz for Q)10 part b and c
    What have you tried? For (b) multiply the LHS by \frac{1 + \sin \theta}{1 + \sin \theta} so you get the denominator as you want and you get a difference of two squares in the numerator that you can Pythagoras and cancel with the denominator.

    For (c) turn everything into sines and cosines and then make common denominators and then use a nice identity in the numerator.
    Offline

    0
    ReputationRep:
    cross multiply in b because one is plus one is minus so they cancel out and your answer is one. c is too hard i havent learnt tan yet
    Offline

    22
    ReputationRep:
    (Original post by white.daniel)
    cross multiply in b because one is plus one is minus so they cancel out and your answer is one. c is too hard i havent learnt tan yet
    No, that's incorrect.
    Offline

    0
    ReputationRep:
    (Original post by Zacken)
    No, that's incorrect.
    did they mean to write a plus on the left side becuase plus doesnt equal minus sign
    Offline

    22
    ReputationRep:
    (Original post by white.daniel)
    did they mean to write a plus on the left side becuase plus doesnt equal minus sign
    sigh, no, your logic is just wrong. You're doing B \Rightarrow A when you should be doing A \Rightarrow B
    Offline

    22
    ReputationRep:
    (Original post by white.daniel)
    theres no a in the question, were looking at part b here

    are you pulling my leg here?
    No - guess you're another troll. Ignored and reported.
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: September 16, 2016
Poll
Do you agree with the proposed ban on plastic straws and cotton buds?
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

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.