Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    3
    ReputationRep:
    Cos theta= (square root 3)/2
    Solve this equation, giving all solutions in radians between -2pi and 2pi
    • Very Important Poster
    Offline

    21
    ReputationRep:
    Very Important Poster
    (Original post by 6kh7741)
    Cos theta= (square root 3)/2
    Solve this equation, giving all solutions in radians between -2pi and 2pi
    What have you tried? What method do you use to solve something that looks like this?
    • Community Assistant
    Offline

    15
    ReputationRep:
    Community Assistant
    (Original post by 6kh7741)
    Cos theta= (square root 3)/2
    Solve this equation, giving all solutions in radians between -2pi and 2pi
    theta=arccos(0.5root3), gives a solution between 0 and pi. cos (theta) = cos (-theta) and cos (theta) = cos (2pi-theta)
    Offline

    10
    ReputationRep:
    Make theta the subject so that you get one of the solutions, then use CAST or the graph method to find the other values between the asked range.
    I'll start you off:
    Theta = cos^-1.......

    EDIT: Also ensure that your calculator is in radians - easy mistake everyone makes!!
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?
Help with your A-levels

All the essentials

The adventure begins mug

Student life: what to expect

What it's really like going to uni

Rosette

Essay expert

Learn to write like a pro with our ultimate essay guide.

Uni match

Uni match

Our tool will help you find the perfect course for you

Study planner

Create a study plan

Get your head around what you need to do and when with the study planner tool.

Study planner

Resources by subject

Everything from mind maps to class notes.

Hands typing

Degrees without fees

Discover more about degree-level apprenticeships.

A student doing homework

Study tips from A* students

Students who got top grades in their A-levels share their secrets

Study help links and info

Can you help? Study help unanswered threadsRules and posting guidelines

Sponsored content:

HEAR

HEAR

Find out how a Higher Education Achievement Report can help you prove your achievements.

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.