AonZ
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
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did this in high school........long time agooooooo.

primeralph
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dw:1370147814899:dw

primeralph
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dw:1370147962686:dw

AonZ
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wow you are good!! :)

AonZ
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thanks yet again!!! :D

primeralph
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Thank you.
Had a good teacher in high school......even though was probably the only one who understood what he was teaching........

AonZ
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where are you from? im from sydney australia

primeralph
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HS or college?

primeralph
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I'm African, but I live in US.