# maths gcse aqa

Watch
Announcements
#1
Help and advice on how to learn the values for sin cos and tan up to 360°
0
1 year ago
#2
(Original post by Revision12321)
Help and advice on how to learn the values for sin cos and tan up to 360°
Aren't all of the maths exams calculator papers? If so, you don't need to learn these values as you can simply type them into your calculator and get results within a second.
0
1 year ago
#3
(Original post by Revision12321)
Help and advice on how to learn the values for sin cos and tan up to 360°
You really just need 0..90 and then the CAST diagram knowledge.

Three things that may help for learning the 0..90 values

1) Remember cos(90-x) = sin(x) so cos(60) = sin(30) etc

2) Think about them as right angled triangles triangles so you can get 30 & 60 by splitting a equilateral triangle in two. The sides of one of the 30-60-90 triangle are in the ratio
1/2 : sqrt(3)/2 : 1 or
1 : sqrt(3) : 2
which are your cos, sin & tan of 30, 60.
Similarly for a right angled isosceles triangle with angles 45, 45 & 90. The sides are in the ratios
1/sqrt(2) : 1/sqrt(2) : 1 or
1 : 1 : sqrt(2).
That gives sin, cos & tan for 45.

3) For memorizing, the hand method
http://www.mrbartonmaths.com/blog/re...ometry-ratios/

TBH, the second point takes a bit of thinking about, but often when you do understand it, its easy to recreate the values if/when you forget.
0
#4
(Original post by mqb2766)
You really just need 0..90 and then the CAST diagram knowledge.

Three things that may help for learning the 0..90 values

1) Remember cos(90-x) = sin(x) so cos(60) = sin(30) etc

2) Think about them as right angled triangles triangles so you can get 30 & 60 by splitting a equilateral triangle in two. The sides of one of the 30-60-90 triangle are in the ratio
1/2 : sqrt(3)/2 : 1 or
1 : sqrt(3) : 2
which are your cos, sin & tan of 30, 60.
Similarly for a right angled isosceles triangle with angles 45, 45 & 90. The sides are in the ratios
1/sqrt(2) : 1/sqrt(2) : 1 or
1 : 1 : sqrt(2).
That gives sin, cos & tan for 45.

3) For memorizing, the hand method
http://www.mrbartonmaths.com/blog/re...ometry-ratios/

TBH, the second point takes a bit of thinking about, but often when you do understand it, its easy to recreate the values if/when you forget.
Thank you not sure I understand what you mean for the second method but thanks
0
1 year ago
#5
(Original post by Revision12321)
Help and advice on how to learn the values for sin cos and tan up to 360°
Hey!

Here's a vid i used when I was learning it:

Hope this helps!
0
1 year ago
#6
(Original post by Revision12321)
Thank you not sure I understand what you mean for the second method but thanks

Explaiin the special triangles - trig values in more detail.
1
#7
(Original post by thestudent33)
Hey!

Here's a vid i used when I was learning it:

Hope this helps!
Thank you so much this helps loads !!!!
1
1 year ago
#8
No problem
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

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

### Poll

Join the discussion

Yes (54)
61.36%
No (34)
38.64%