You are Here: Home >< Maths

# C3 Trigonometric Identities watch

1. Solve for values of in the interval , the equation:

I've tried rearranging it and so on but I haven't managed to reach the solution yet. Thanks!
2. cot = cos/sin

sin^2 = 1 - cos^2

Is that a quadratic in cos?
3. 3cos(x)/sin(x) = 2sin(x) => 2sin^2(x)=3cos(x) => 2(1-cos^2(x)) = 3cos(x) => 2cos^2(x) + 3cos(x) - 2=0. Then just solve as a quadratic

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: February 11, 2010
Today on TSR

### Congratulations to Harry and Meghan!

But did you bother to watch?

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