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AonZ
 2 years 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
AonZ
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.1did this in high school........long time agooooooo.

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

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

primeralph
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.0where are you from? im from sydney australia

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