T-formulae question (1 Viewer)

[enigma_1]

If tan (theta/2)=t, solve for t the equation 12 tan theta = 5 and 180 < theta < 270

I'm getting tan theta = -5 and 1/5 but in the answers it only says -5, why?

 

[obliviousninja]

Oh, i was like wtf 12tan theta =5 and 180.

 

[enigma_1]

Oh, i was like wtf 12tan theta =5 and 180.

Yeah lol I just realised haha. How do you do it?

 

[obliviousninja]

180 < theta < 270
90 < theta/2 < 135 hence negative for tan.

Therefore solution must be a negative, hence -5.

 

[enigma_1]

Help guys!!!! Before I pull my hair out!

 

[braintic]

Help guys!!!! Before I pull my hair out!

obliviousninja answered correctly below

 

[enigma_1]

OMG THANKSS!! How did I not divide by 2....