Maths help please (1 Viewer)

[YaMiTe]

http://community.boredofstudies.org/attachment.php?attachmentid=20528&stc=1&d=1274255479

I simplified that and got tan x.

But the second part is: (b) Hence find the exact value of tan 15.

Anyone know how to do this?


Also, are there worked solution for the 'maths in focus' books since ive seen solutions for cambridge and fitzpatrick.

 

[ohexploitable]

 

[hscishard]

http://community.boredofstudies.org/attachment.php?attachmentid=20528&stc=1&d=1274255479

I simplified that and got tan x.

But the second part is: (b) Hence find the exact value of tan 15.

Anyone know how to do this?


Also, are there worked solution for the 'maths in focus' books since ive seen solutions for cambridge and fitzpatrick.

I think you need to check your part a.

 

[ohexploitable]

Oh wait... just read your question...

It's actually cotx when you simplify it...

Anyway... to find tan 15, let x=15

So...



And simplify...

 

[Omnipotence]

- Ah crap quoted wrong thing.

 

[YaMiTe]

I think you need to check your part a.

Sorry guys the part a is actually a + on the bottom.
sin 2x/1+cos2x
Sorry.

 

[ohexploitable]

k, when simplified it becomes tan(x)

to find tan 15 do the same thing i posted above