Hey there! Sign in to join this conversationNew here? Join for free
Turn on thread page Beta
    • Thread Starter
    Offline

    6
    ReputationRep:
    Please help me with this question:

    Show that 2cos^2x + 3sinx=3 may be written as 2sin^2x - 3sinx+1=0.

    ---Moved to Maths---
    Offline

    1
    ReputationRep:
    Try replacing  cos^{2}x by making it the subject of the identity

    cos^{2}x + sin^{2}x = 1
    • Thread Starter
    Offline

    6
    ReputationRep:
    (Original post by tajtsracc)
    Since there's isn't any cos in the second equation, you should probably substitute cos2x in the first equation with an identity to get rid of it.
    Oh i think I understand now thank you
    • Thread Starter
    Offline

    6
    ReputationRep:
    (Original post by Astro_Joe)
    Try replacing  cos^{2}x by making it the subject of the identity

    cos^{2}x + sin^{2}x = 1
    Thanks
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: February 7, 2017
Poll
“Yanny” or “Laurel”
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.