Question 19 (4 marks):
It is given that cos α = t where t is a constant and 0o ≤ α ≤ 90o.
Express in terms of t
(a) sin (180o + α),
(b) sec 2α.
Solution:
(a)
![](http://spmaddmaths.blog.onlinetuition.com.my/wp-content/uploads/sites/3/2019/11/Picture61-1.png)
(b)
It is given that cos α = t where t is a constant and 0o ≤ α ≤ 90o.
Express in terms of t
(a) sin (180o + α),
(b) sec 2α.
Solution:
(a)
![](http://spmaddmaths.blog.onlinetuition.com.my/wp-content/uploads/sites/3/2019/11/Picture61-1.png)
(b)