Which of the following is not equivalent to the other three?
a.
sin x
sinx
C.
tan x
1– cosx'1+cosx
secx-1
b. 2 cotx sec x
d.
A
B
C
D
Please select the best answer from the choices provided
+
sin x
1- sin x
tanx
secx + 1
+
sin x
1+ sin x