#trig

3 messages · Page 1 of 1 (latest)

mystic ermine
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how do they get from line 1 to line 2?

image.png
slim geode
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Well cos(2x) is the same as 1-2sin^2(x)

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So that means if x is Theta/2 then costheta = 1-2sin^2(theta/2)