I told you I was ill is a tumblelog.

Maths question of the day

nikkiisgross:

(AKA, someone help me with my homework)

prove that:

Cos(2x) = (1-tan^2 x) / (1+tan^2 x)

cos(2x) = cos^2 x - sin ^2 x

 = (cos^2 x - sin ^2 x) / 1

 = (cos^2 x - sin ^2 x) / (sin ^2 x + cos^2 x)

From this point, divide the top and bottom expressions by cos^2 x (this is equivalent to multiplying by cos^2 x / cos^2 x = 1) and then remember that

 tan x = sin x /cos x.

(Source: youngandnative)

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Shurely shome mishtake?

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… Craig.

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