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

From the figure, we have

Therefore, the exact value of 