Hey guys. I'm a 2014 graduate. Post any questions and I'll do my best to help! (1 Viewer)

[jamesh1234]

I graduated with a band 6 in ext 1 in 2014. This site helped me a lot and I want to give back. Post any questions you got and I'll try to help!

James Huang
Tutor of Maths Ext 1- 93 in 2014
Get some more ansers for your questions from me and me friends at:
HSC- https://www.facebook.com/groups/1011024022302622
VCE- https://www.facebook.com/groups/1562196880771131

 

[fifibum]

Hey, I'm doing prelim 3U trig and I don't know how to do this question from Maths In Focus:
Find the exact value of
2tan 120/1-tan^2 120

:/

 

[Flop21]

Hey, I'm doing prelim 3U trig and I don't know how to do this question from Maths In Focus:
Find the exact value of
2tan 120/1-tan^2 120

:/

Is the answer -root(3)?

 

[InteGrand]

Is the answer -root(3)?

It's just sqrt(3).

 

[davidgoes4wce]

Hey, I'm doing prelim 3U trig and I don't know how to do this question from Maths In Focus:
Find the exact value of
2tan 120/1-tan^2 120

:/

 

[InteGrand]

Another way to do it is to recall that 2t/(1 – t²) = tan(theta), where t = tan(theta/2). In this case, theta/2 = 120 deg, so theta = 240 deg, so the expression equals tan(240 deg) = tan(60 deg) = sqrt(3).

 

[fifibum]

Thanks!