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View Full Version : (1 cosu)/(1-cosu) - (1-cosu)/(1 cosu) = 4cotucscu


Ranya
Nov 14, 2010, 09:51 PM

Unknown008
Nov 14, 2010, 10:58 PM
1. Combine the two fractions on the left hand side.
2. Use the difference of two squares; (a+b)(a-b) = a^2 - b^2, on the denominator.
3. Expand the numerator.
4. Simplify.

You should get there fast enough.

Ranya
Nov 15, 2010, 06:28 AM

Ranya
Nov 15, 2010, 06:29 AM

ebaines
Nov 15, 2010, 02:08 PM
Hint: first step is to replace the cotu and tanu functions with their sine and cosine equivalents.