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# Need help with Maths (GCSE)

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1. Right, I have exam coming up soon and I really need to learn the sin and cos wave and how to describe the TERRible (Translation, Enlargement, Reflection and Rotations). My maths teacher have chosen the worse time to be ill and stay home and other math teachers haven't been helpful '"why would a C-grade student be asking for help on A* topics"' '"You don't need to learn that"' '"it's not important, you don't need that, focus on C's topic"'
They don't understand that I want A* in my maths so I do need to learn Sin and Cos wave, can someone help me learn and understand it?
2. These videos should be quite helpful:

3. (Original post by LivMalseed)
Right, I have exam coming up soon and I really need to learn the sin and cos wave and how to describe the TERRible (Translation, Enlargement, Reflection and Rotations). My maths teacher have chosen the worse time to be ill and stay home and other math teachers haven't been helpful '"why would a C-grade student be asking for help on A* topics"' '"You don't need to learn that"' '"it's not important, you don't need that, focus on C's topic"'
They don't understand that I want A* in my maths so I do need to learn Sin and Cos wave, can someone help me learn and understand it?
So..........
Sin wave is very simple

At 180 degree, the number is at 0 because it's on the line but if the point is at 90 degree then it should be at 1.
Go on the calculator and put SIN(90), the answer should be 1
Also, if you put SIN(180) then the answer would be 0.
The reasons why:
For example:
If you put the point on the disc and the pencil in the middle so you can roll on it, two tables , the gap where you should put the disc, roll it, you can see the point, it starts from the 180 to 90 and gone down to 180 to 90 down then up to 180 to 90 up. Go on the Internet, put sin x wave. You will understand my point.

Cos wave

Very complicated so I will try my best to explain in details

If you put in the calculator, cos(180), the answer is -1 and 90= 0
So why?
Because it doesn't start at 180.
It's starts at 0 degree so the answer in the calculator will be 1. ( cos(0)=1)

So it did start in 0 degree moves to 90 which is 0 and then moves to 180 which is -1 etc......270 degree back to 0.

So the graph should start from 0 to 180 from 1 to -1.
Look on the Internet, cos x wave

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