Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    show that the equation tan(x+45)=6tanx can be written as in the form 6tan^2 x - 5tanx + 1 = 0
    Offline

    2
    ReputationRep:
    (Original post by TumiZN)
    show that the equation tan(x+45)=6tanx can be written as in the form 6tan^2 x - 5tanx + 1 = 0
    If you use the formula tan(a+b)= tan a + tan b/ 1-tanatanb
    And you should get there.
    Offline

    15
    ReputationRep:
     \displaystyle \tan(A+B)=\frac{\tan A+\tan B}{1-\tan A \tan B}

    Remember that  \tan 45^{\circ} =\frac{\sqrt 2}{2} .
    • Study Helper
    Offline

    16
    ReputationRep:
    Study Helper
    (Original post by B_9710)
     \displaystyle \tan(A+B)=\frac{\tan A+\tan B}{1-\tan A \tan B}

    Remember that  \tan 45^{\circ} =\frac{\sqrt 2}{2} .
    Right method, but the tangent of 45 degrees is a lot nicer number than that
    Offline

    22
    ReputationRep:
    (Original post by B_9710)
     \displaystyle \tan(A+B)=\frac{\tan A+\tan B}{1-\tan A \tan B}

    Remember that  \tan 45^{\circ} =\frac{\sqrt 2}{2} .
    The way I like to remember \tan \frac{\pi}{4} is to remember that that's where \sin x = \cos x, and since \tan x = \frac{\sin x}{\cos x} then we know that \tan \frac{\pi}{4} = 1. I know you know this, but this is for anybody else who's reading it.
    Offline

    20
    ReputationRep:
    tan45° = 1
    Offline

    19
    ReputationRep:
    am I too late?
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: March 1, 2016

University open days

  • University of Exeter
    Undergraduate Open Days - Exeter Campus Undergraduate
    Wed, 24 Oct '18
  • University of Bradford
    Faculty of Health Studies Postgraduate
    Wed, 24 Oct '18
  • Northumbria University
    All faculties Undergraduate
    Wed, 24 Oct '18
Poll
Do protests make a difference in political decisions?
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

Equations

Best calculators for A level Maths

Tips on which model to get

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.