00:01
I have a question.
00:01
In this 10u is being given as minus 5 by 12, where u belongs to the quadrant.
00:13
So, i need to first find in which quadrant u by 2 lies.
00:19
I will be dividing all the terms by 2.
00:23
So, it will be 3 pi by 4 u by 2 and 2 pi by 2 which is pi.
00:31
3 pi by 4 2 pi.
00:33
So, u will belong to quadrant number 2, option number b.
00:40
Part b, i need to find sin u by 2 cos u by 2 tan u by 2.
00:44
Every of this formula contains the value of cos.
00:54
So, i will be using the formula that sec square u minus 10 square u equal to 1.
01:04
So, sec u will be plus minus 1 plus 10 square u.
01:09
Now, for u, it is given that u belongs to quadrant number 4.
01:14
So, we will be taking it positive.
01:16
So, 1 by, but i need to find the value of cos.
01:21
Cos u will be 1 by 1 plus 10 square u.
01:27
25 by 144.
01:36
So, this is 12 by 13.
01:41
Let us plug in over here.
01:43
Sin u by 2 plus minus 1 minus cos u by 2...