Turn on thread page Beta
    • Thread Starter

    Please help me solve this... I'm completely stuck....
    Consider the function f(x)=sinpx, pER, 0 less than or equal to x less than or equal to 360. The closest point to the origin that the graph of f(x) crosses the x axis has coordinates 36 degrees.
    1. Determine the value of p and sketch the graph y=f(x) answer is p=5
    2. Write down the period of f(x)
    Answer is 72 degrees
    Thank you

    The curve y=sinx crosses the x axis at 180 degrees - closest root to the origin.
    If for y=sin(px) this point is now at 36 degrees then the curve must have been 'compressed' by a scale factor of 180/36=5 (stretched by a scale factor of 1/5 more precisely), so p is 5.
    Assuming you know what the period of a periodic function is, finding the period of f should be straight forward.


students online now


Exam discussions

Find your exam discussion here

Should predicted grades be removed from the uni application process
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


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

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...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.