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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
 10 months ago
 10 months 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
 10 months ago
 10 months ago

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primeralphBest ResponseYou've already chosen the best response.1
did this in high school........long time agooooooo.
 10 months ago

primeralphBest ResponseYou've already chosen the best response.1
dw:1370147814899:dw
 10 months ago

primeralphBest ResponseYou've already chosen the best response.1
dw:1370147962686:dw
 10 months ago

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

AonZBest ResponseYou've already chosen the best response.0
where are you from? im from sydney australia
 10 months ago

primeralphBest ResponseYou've already chosen the best response.1
I'm African, but I live in US.
 10 months ago
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