Question 4i please http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s08_qp_3.pdf

Question

ganeshie8 · Answer

look up tan(A+B), tan(A-B) formulas

lxelle · Answer

I did, 
(tan 30 + tan x)/(1+ tan30tanx) = 2(tan60-tanx)/1-tan60tanx)

ganeshie8 · Answer

I would start the same.. looks good

ganeshie8 · Answer

hey wait, double check the formula once

lxelle · Answer

Could you point out the mistakes?

anonymous · Answer

doesn't the addition angle formula (which i always forget) do it?

lxelle · Answer

Whats that?

anonymous · Answer

nvm it is what you are doing

ganeshie8 · Answer

lxelle · Answer

Ahhh, no wonder.

ganeshie8 · Answer

Notice that in tan(A+B) formula, the denominator has negative sign, not positive..

lxelle · Answer

yes thanksss. i just realized this. D: