Posted by **Anonymous** on Saturday, November 9, 2013 at 1:29pm.

I don't understand how rationalizing the numerator of tan(1/2)x=sin x/(1+cos x) results tan(1/2)x=(1-cos x)/sin x. The question is what do you multiply by to the first equation to get the second.

## Answer This Question

## Related Questions

- Trig - Given: cos u = 3/5; 0 < u < pi/2 cos v = 5/13; 3pi/2 < v < ...
- precalculus - For each of the following determine whether or not it is an ...
- Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...
- Trigonometry - 1.Solve tan^2x + tan x – 1 = 0 for the principal value(s) to two ...
- Trigonometry - Please review and tell me if i did something wrong. Find the ...
- Trigonometry desperate help, clueless girl here - 2. solve cos 2x-3sin x cos 2x...
- math - Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the ...
- Math - Prove each identity: a) 1-cos^2x=tan^2xcos^2x b) cos^2x + 2sin^2x-1 = sin...
- math - Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the ...
- Maths- complex numbers - Find tan(3 theta) in terms of tan theta Use the formula...

More Related Questions