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 one year ago
Let t = tan x/2
write cos^2 (x/2) as 1/ sec^2 (x/2)
and hence show that cos x = 1 t^2 / 1+t^2
 one year ago
Let t = tan x/2 write cos^2 (x/2) as 1/ sec^2 (x/2) and hence show that cos x = 1 t^2 / 1+t^2

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primeralph
 one year ago
Best ResponseYou've already chosen the best response.1did this in high school........long time agooooooo.

primeralph
 one year ago
Best ResponseYou've already chosen the best response.1dw:1370147814899:dw

primeralph
 one year ago
Best ResponseYou've already chosen the best response.1dw:1370147962686:dw

primeralph
 one year ago
Best ResponseYou've already chosen the best response.1Thank you. Had a good teacher in high school......even though was probably the only one who understood what he was teaching........

AonZ
 one year ago
Best ResponseYou've already chosen the best response.0where are you from? im from sydney australia

primeralph
 one year ago
Best ResponseYou've already chosen the best response.1I'm African, but I live in US.
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