Answer:
see explanation
Step-by-step explanation:
Using the difference formulae for sine and cosine
sin(x - y) = sinxcosy - cosxsiny
cos(x - y) = cosxcosy + sinxsiny
sin15° = sin(45 - 30)°
sin(45 - 30)°
= sin45°cos30° - cos45°sin30°
=
×
-
× 
=
- 
= 
----------------------------------------------------------------------------------
cos15° = cos(45 - 30)°
cos(45 - 30)°
= cos45°cos30° + sin45°sin30°
=
×
+
× 
=
+ 
= 
-------------------------------------------------------------------------------------
tan15° = 
=
× 
= 
Rationalise the denominator by multiplying numerator/ denominator by the conjugate of the denominator, that is (
-
)
= 
= 
= 
= 2 - 
Set each equation to get Y by its self
Then set the equations equal to each other and solve for X
Easy(: