Question 973828
Which of the following is equivalent to 1/(1-cos(x))- 1/(1+cos(x))?
A) 2cot(x)csc(x)
B) 2tan(x)sec(x)
C) 2+cot^2(x)
D) 4sec(4x)
E) 0

When I subtract I get 
2cos(x)/1-cos^2(x)
= 2cos(x)/sin^2(x)
= 2(cos/sin)(1/sin)
= 2cot(x)*csc(x)