Thursday

November 27, 2014

November 27, 2014

Posted by **kristen** on Wednesday, July 16, 2008 at 6:35pm.

cot(A-B)= cotAcotB+1/cotB-cotA

thanks for any help at all

- trig -
**drwls**, Wednesday, July 16, 2008 at 6:48pmIs the final term

1/(cotB-cotA) or

(1/cotB)-cotA ??

Is the numerator term (cotA cotB +1) or 1 ?

When you write equations like that, we can't tell what you mean.

I suggest you start with the identities for cos (A-B) and sin (A-B) and take the ratio of the two.

- trig -
**Anonymous**, Saturday, May 11, 2013 at 12:02pmcos(a+b)/sin(a+b)=

cosacosb+sinasinb/sinacosb-cosasinb

multiplying and dividing by sinasins then it becomes

cotacotb+1/cotb-cota

**Answer this Question**

**Related Questions**

trig - Establish the following identity: CosA/1-TanA + SinA/1-CotA = CosA-SinA

PreCalculus (PLEASE HELP, IM BEGGING!) - Can anyone please explain these ...

trig help - verify that cos(A-B)/cosAsinB=tanA+cotB is an identity

Trig - verify the following identity: cos(A-B)/cosAsinB=tanA+cotB

Trig - HELP!!!! I dont know how to do the trig identity with this problem csc^4 ...

trig - Establish the trigonometric identity (Hint: Use sum to product) cos(5x)+...

trig - For each expression in column I, choose the expression from column II to ...

mathematics trignometry - prove that the following are identity 1. (cotA+cosecA-...

trig - Match each ratio in the first row with an equivalent ratio from the ...

trig - prove the identity sec^2x times cot x minus cot x = tan x