Monday

September 22, 2014

September 22, 2014

Posted by **Sam** on Wednesday, November 6, 2013 at 5:21pm.

I tried drawing perpendiculars and stuff but it doesn't seem to work?

For me, the trig identities don't seem to plug in as well.

Help is appreciated, thanks.

- Math-Trigonometry -
**Steve**, Wednesday, November 6, 2013 at 7:27pmC = 180-(A+B), so

tan C = -tan(A+B) = (tanA+tanB)/(tanAtanB-1)

tanA+tanB+tanC

= tanA+tanB + (tanA+tanB)/(tanAtanB-1)

= (tanA+tanB)(1 + 1/(tanAtanB-1))

= (tanA+tanB)(tanAtanB)/(tanAtanB-1)

= (tanAtanB)(tanA+tanB)/(tanAtanB-1)

= tanAtanBtanC

- Math-Trigonometry -
**Sam**, Thursday, November 7, 2013 at 10:09amThanks a ton!

**Answer this Question**

**Related Questions**

Trigonometry - Find the exact value of tan(a-b) sin a = 4/5, -3pi/2<a<-pi...

Trig. - sec^2xcotx-cotx=tanx (1/cos)^2 times (1/tan)-(1/tan)=tan (1/cos^2) times...

Trig - tan 15° using composite argument? - tan 15° tan (45°-30°) (tan 45° - tan ...

calculus - can anyone tell me if tan-1x= 1 over tan x? No. They are different. ...

Integration - Intergrate ¡ì sec^3(x) dx could anybody please check this answer. ...

trig - h t t p : / / i m g 4 0 . i m a g e s h a c k . u s / c o n t e n t . p h...

calculus - If limit as delta x approaches 0 of tan(0+Δx)-tan(0)/Δx =1 ...

Trigonometry - Hello, everyone: I am working on finding the exact values of ...

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

Math- Precalculus - Write the expression as the sine, cosine, tangent of an ...