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January 22, 2017
Posted by **Shasha** on Tuesday, November 27, 2012 at 11:20pm.

- calculus -
**Jennifer**, Wednesday, November 28, 2012 at 3:15pmUse some trig identities:

tan(-x) = tan(x)

csc(x) = 1/sin(x)

tan(x) = sin(x)/cos(x)

tan(-x)*csc(x) = tan(x)*(1/sin(x) = (sin(x)/cos(x))*(1/sin(x) = 1/cos(x) = sec(x)