Which of the following best explains why the derivative of cscx has a negative sign?
a) Because the derivative of sinx is −cosx, so differentiating 1/sinx introduces the negative
b) Because cscx is the reciprocal of sinx, and differentiating a reciprocal introduces a negative factor
c) Because cscx is an odd function, and differentiating an odd function produces an extra negative sign
d) Because cscx is often confused with sin−1x, whose derivative carries a minus sign