Question
If 
calculate cos A and tan A.
Solution
Let us draw a right angle triangle, right angled at B.
We know that:
Let BC = 3K, AC = 4K
where K is a positive number.
Using Pythagoras theorem, we have
Now,
and
We know that:
Let BC = 3K, AC = 4K
where K is a positive number.
Using Pythagoras theorem, we have
Now,
and
