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Tranformation of curves Help! Watch

1. y= sinx
At 60° sinx =?3/2
The sinx graph is 0<x? 360°
What it is sinx at 120° and 180°?
2 marks

This is a GSCE transformation of curve question I think s? _ we haven’t done the topic yet. It was in my mock paper last week and I wanted to find out if what I wrote might be right: at 120° sinx =?6/2 and at 270° sinx=?12/2I wrote.
2. Do you know how to draw a graph of ?

If you do (as you need to), draw lines along and see what you notice where .

(Original post by Sunday=)
if what I wrote might be right: at 120° sinx =(?6)/2 and at 270° sinx=(?12)/2, I wrote.
That's not right I'm afraid.
3. (Original post by nuodai)
Do you know how to draw a graph of ?
That's not right I'm afraid.
I did not know how to draw the graph but I don't suppose you could also answer this question as well. It's a simitalneous equation:
x^2+y^2=5
y=3y+1

when I worked it out x was -1 and and -0.4 and y was -2 and -1
4. (Original post by Sunday=)
I did not know how to draw the graph but I don't suppose you could also answer this question as well. It's a simitalneous equation:
x^2+y^2=5
y=3y+1

when I worked it out x was -1 and and -0.4 and y was -2 and -1
Did you write it down correctly the equation?
5. sin120=rt3/2 as the sinx graph has reflectional symmetry along the lines
x=90 (mod 180) (this just means it has reflectional symmetry along lines where x is 90 more than a multiple of 180 eg x=90, x=270, x=-90 etc). In this case we look at the line x=90. As 60 and 120 are both the same 'distance' from 90, their sine values will be the same.
sin180=0, as does the sine of any multiple of 180 including 0 and negative multiples.

I assume you meant to write y=3x+1 for the second equation.
If so your answers are not quite correct. Also, you should write them in pairs of x,y:
x=-1, y=-2 or x=2/5, y=11/5

This means there will be no confusion as to which value of one variable implies which valuable of the other variable.
6. (Original post by hazbaz)
Did you write it down correctly the equation?
Yeah I see what you mean. They is a mistake, it's:

x squared + y squared = 5
y=3x+1

Is this clearer?
7. (Original post by j.alexanderh)
sin120=rt3/2 as the sinx graph has reflectional symmetry along the lines
x=90 (mod 180) (this just means it has reflectional symmetry along lines where x is 90 more than a multiple of 180 eg x=90, x=270, x=-90 etc). In this case we look at the line x=90. As 60 and 120 are both the same 'distance' from 90, their sine values will be the same.
sin180=0, as does the sine of any multiple of 180 including 0 and negative multiples.

That silmitenous equation question was worth 6 marks, it was the last question on the paper too which means it must have been A*- how disapointing!

And thanks for the transformation of curve info, you make it sound so easy but I'm no wiser.
8. (Original post by Sunday=)
That silmitenous equation question was worth 6 marks, it was the last question on the paper too which means it must have been A*- how disapointing!

And thanks for the transformation of curve info, you make it sound so easy but I'm no wiser.
Sine graph: This has nothing to do with transformation of curves.

Google image the sine graph. You will see that it is symmetrical along the line x=90. As 60 and 120 are the same 'distance' from 90 (both 30 away) their sine values will be the same. This will be made far clearer by looking at a good graph.

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