Answer:
 The exact value of  and
 and   
Step-by-step explanation:
Consider the Special right angle   triangle  as shown in the attachment.
 triangle  as shown in the attachment.
The ratio of its sides are  as shown in figure. The smallest side, opposite the
 as shown in figure. The smallest side, opposite the  angle, is 1. The side opposite the angle
 angle, is 1. The side opposite the angle   is
 is  . The longest side, i.e the hypotenuse is  2.
. The longest side, i.e the hypotenuse is  2.
Therefore, any triangle of  will have its side in their ratios.
 will have its side in their ratios.
To find the exact value of  .
.
By definition;

From the figure and by definition of sine:

Therefore, the exact value of  .
.
Now, to find the exact value of 
For this , we have special right angle  triangle, as shown in the attachment.
 triangle, as shown in the attachment.
The ratio of its sides are  .
.
By definition of tangent,

From the figure, we have 

Therefore, the exact value of 