Wednesday

August 27, 2014

August 27, 2014

Posted by **Steve** on Saturday, October 24, 2009 at 3:56pm.

(sin m +sin n)/ (cos m + cos n) = tan(m + n/2)

- Trig -
**jim**, Saturday, October 24, 2009 at 5:50pmI suspect you mean

tan((m + n)/2)

on the RHS

- Trig -
**Steve**, Saturday, October 24, 2009 at 11:28pmyes i do.

- Trig -
**Arya**, Tuesday, December 1, 2009 at 5:07amUse Lemma

sin m + sin n = 2sin(m+n/2)cos(m-n/2)

cos m + cos n = 2cos(m+n/2)cos(m-n/2)

We get

(sin m +sin n)/cos m + cos n) = sin(m+n/2)/cos(m+n/2) = tan m+n/2)

**Related Questions**

Trig - Given: cos u = 3/5; 0 < u < pi/2 cos v = 5/13; 3pi/2 < v < ...

trig - it says to verify the following identity, working only on one side: cotx+...

TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...

Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...

precalculus - For each of the following determine whether or not it is an ...

Math - Calculus - The identity below is significant because it relates 3 ...

MathsSs triG - Consider sin(x-360)sin(90-x)tan(-x)/cos(90+x) 1.A.SIMPLIFY sin(x-...

trig 26 - simplify to a constant or trig func. 1. sec ²u-tan ²u/cos ²v+sin ²v ...

trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...

Trigonometry - 1.Solve tan^2x + tan x – 1 = 0 for the principal value(s) to two ...