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(1-sin^2x/cosx)= (sin2x/2sinx)
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Apr 27, 2015
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(1-sin^2x/cosx)= (sin2x/2sinx)
Mathematics
high-school
Iakobski
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Iakobski
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Left side:
1-sin²(x) = cos²(x)
1-sin²(x) / cos(x) = cos²(x) / cos(x) =
cos(x)
Right side:
sin(2x) = 2 sin(x) cos(x)
sin(2x) / 2 sin(x) = 2 sin(x) cos(x) / 2 sin(x) =
cos x
Thomas Dickey
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May 3, 2015
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Thomas Dickey
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