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

FP1: How to do cot^-1(x) on calculator?

    • Thread Starter
    Offline

    0
    ReputationRep:
    I tried 1 / tan^-1(-ln2) and got -1.65 but need 2.18, adding pi didnt work either
    Offline

    3
    ReputationRep:
    (Original post by JartX)
    I tried 1 / tan^-1(-ln2) and got -1.65 but need 2.18, adding pi didnt work either
    ArcCot(x) = ArcTan(1/x), not 1/ArcTan(x)
    Offline

    3
    ReputationRep:
    If arccot x = y

    And you need to find y.

    Cot y = x

    Tan y = 1/x

    y = Arctan 1/x
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by RichE)
    ArcCot(x) = ArcTan(1/x), not 1/ArcTan(x)
    but for sin and cos its what i originally did?
    Thanks
    Offline

    3
    ReputationRep:
    (Original post by JartX)
    but for sin and cos its what i originally did?
    Thanks
    What?
 
 
 
Poll
Do you have exam superstitions?
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.