You are Here: Home >< Maths

# Trigs Watch

1. Why does the minimum for y=5sin(3x-53.1) occur at 3x-53.1=270 and not -90?

Thanks!
2. (Original post by Zenarthra)
Why does the minimum for y=5sin(3x-53.1) occur at 3x-53.1=270 and not -90?

Thanks!
i assume it's because you want the smallest positive value of x such that it is minimised. Otherwise -90 works fine.
3. (Original post by Zenarthra)
Why does the minimum for y=5sin(3x-53.1) occur at 3x-53.1=270 and not -90?

Thanks!
A local minimum occurs at both values. But if your domain is restricted then only one of these may be relevant.
4. Thanks

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 16, 2014
Today on TSR

### I don't drink alcohol...

Is freshers still worth it?

### Girlfriend wants me to make her cry...

Discussions on TSR

• Latest
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