You are Here: Home >< Maths

# C2 Review exercise 3 Q17 (a) Watch

1. The curve S, for 0≤𝑥<360°, has equation 𝑦 = 2sin[(2/3)𝑥 - 30°].
(a)Find the coordinates of the point where S meets the 𝑦-axis.

Ans:
𝑥 = 0
𝑦 = 2sin[(2/3)*(0) - 30°]
= 2sin[ - 30°]
= 2*(-½)
= -1

But the answer given in the book is (0,-2).
Can anyone please tell me what I did wrong?
2. (Original post by hajerabazaz)
The curve S, for 0≤𝑥<360°, has equation 𝑦 = 2sin[(2/3)𝑥 - 30°].
(a)Find the coordinates of the point where S meets the 𝑦-axis.

Ans:
𝑥 = 0
𝑦 = 2sin[(2/3)*(0) - 30°]
= 2sin[ - 30°]
= 2*(-½)
= -1

But the answer given in the book is (0,-2).
Can anyone please tell me what I did wrong?
Book's wrong.

(0,-1) is correct.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: April 5, 2016
Today on TSR

### Last-minute PS help

100s of personal statements examples here

### More pressure for kinky sex?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• 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

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