Solution of Some Difficult Problems in
Trigonometry
1. If 
Proof: Given,
(Proved)
2. In a 
Prove that 
Proof:
In the right
angled triangle ABC, 
Now,
[
[
(Proved)
3. If 
then prove that 
Proof:
Given,
Now,
[ 
Now, Subtracting equation 
from equation 
Again,
Now,
L.H.S = 
Again,
Adding equations and we get,
From equation 
[ 
(Proved)
4. Prove that 
5. Prove that 
(Proved)
6. If 
then prove that 
(Proved)
