6.2.2 Sudut Khas
1. Nilai fungsi trigonometri bagi sudut-sudut khas
(a) Nilai bagi sudut khas 30odan 60o
![](http://spmmatematiktambahan.blog.onlinetuition.com.my/wp-content/uploads/sites/8/2015/11/Picture-2.png)
\(\boxed{\begin{array}{l}\text{ (a)}\sin30^o=\frac12\text{ (b)}kos30^o=\frac{\sqrt3}2\text{(c)}tan30^o=\frac1{\sqrt3}\\\text{ (d)}\sin60^o=\frac{\sqrt3}2\text{ (e)}kos60^o=\frac12\text{ (f)}tan60^o=\sqrt3\text{ }\end{array}}\)
(b) Nilai bagi sudut khas 45o
![](http://spmmatematiktambahan.blog.onlinetuition.com.my/wp-content/uploads/sites/8/2015/11/Picture-3-277x300.png)
\(\boxed{\text{ (a)}\sin45^o=\frac1{\sqrt2}\text{ (b)}kos45^o=\frac1{\sqrt2}\text{ (c)}tan45^o=1\text{ }}\)
(c) Nilai bagi sudut khas 0o, 90o, 180o ,270o ,360o
(i) Graf y = sin x, 0o ≤ x ≤ 360o
![](http://spmmatematiktambahan.blog.onlinetuition.com.my/wp-content/uploads/sites/8/2015/11/Picture-4.png)
x |
0o |
90o |
180o |
270o |
360o |
sin |
0 |
1 |
0 |
-1 |
0 |
![](http://spmmatematiktambahan.blog.onlinetuition.com.my/wp-content/uploads/sites/8/2015/11/Picture-5.png)
![](http://spmmatematiktambahan.blog.onlinetuition.com.my/wp-content/uploads/sites/8/2015/11/Picture44.png)
(iii) Graf y = tan x, 0o ≤ x ≤ 360o
![](http://spmmatematiktambahan.blog.onlinetuition.com.my/wp-content/uploads/sites/8/2015/11/Picture-6.png)
x |
0o |
90o |
180o |
270o |
360o |
tan |
0 |
∞ |
0 |
∞ |
0 |