3sin–1 x = sin–1 (3x – 4x3), 
1
1
–
2,
2
x


∈



2 3cos–1 x = cos–1 (4x3 – 3x), 
21 , 1
x


∈



Write the following functions in the simplest form:
3 2
1
1
1
tan
x
x
−
+
− , x ≠ 0
4 1
1
cos
tan
1
cos
x
x
− 

−




+


, 0 < x < π
5