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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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

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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did this in high school........long time agooooooo.
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wow you are good!! :)
thanks yet again!!! :D
Thank you. Had a good teacher in high school......even though was probably the only one who understood what he was teaching........
where are you from? im from sydney australia
HS or college?
I'm African, but I live in US.

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