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May 29, 2016
Posted by **Tom** on Monday, March 5, 2012 at 4:39pm.

thanks for your help

- Math -
**MathMate**, Monday, March 5, 2012 at 5:12pmHints:

Use the quotient rule:

d(u/v)=(vdu-udv)/v^2

set

u=sin(x) du/dx=cos(x)

v=cos(x) dv/dx=-sin(x)

and

finally use the identity

sec(x)=1/cos(x)