Trig Question (1 Viewer)

[Saturn WY15]

Hey Guys i need help with this question

b
i) Express the tan 2θ in term's of tan θ
ii) Hence evaluate tan 22.5 degree's om surd form by letting θ= 22.5 degree's from i

Obviously i can the first question, but i don't know how to do second one.

Thanks
W.Y

 

[SpiralFlex]

Let










Therefore,

ONLY! (Since it must be acute.) Very cute.

 

[Saturn WY15]

Thank's alex

I knew i was on the right track, i just forget the LHS = 1

 

[Saturn WY15]

accidentally put 22.5 degree as 25. Such a noob

 

[SpiralFlex]

No worries! Good luck with your yearly examinations.

 

[Saturn WY15]

You too man, how u been ? i swear its like ages since we last talk.

 

[SpiralFlex]

Hungry and tired.