Q. 1.
If
, find the value of
.
Q. 2. What is the maximum value of 
Q. 3. If 
and 0° < θ < 90°, find the value of θ.
Without using trigonometric tables, evaluate:
Q. 4. Prove that:
Q. 5. Prove that:
Q. 6.
If 
are acute angles and 
Q. 7. If
Q. 8. If
Q. 9. If
Q. 10. If
prove that 
