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d_m1771
Mar 26, 2007, 10:49 AM
:confused: 1-cot x
______

tan x - 1

galactus
Mar 26, 2007, 01:36 PM
What are you supposed to do? Simplify?

Rewrite as:

\frac{1-\frac{cos(x)}{sin(x)}}{\frac{sin(x)}{cos(x)}-1}

This equals:

\frac{\frac{sin(x)-cos(x)}{sin(x)}}{\frac{sin(x)-cos(x)}{cos(x)}}

=\frac{\sout{sin(x)-cos(x)}}{sin(x)}\cdot\frac{cos(x)}{\sout{sin(x)-cos(x)}}

=\frac{cos(x)}{sin(x)}=cot(x)