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Cos(2x) = 1 - 2 Sin^2 (x)
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Cos(2x) = 1 - 2 Sin^2 (x)

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Cos(2x) = 1 - 2 Sin^2 (x) Trigonometric Identities

Proving Trigonometric Identities by Graphical Method

Proving identities
y = cos 2(x) is identical to
y = 1 - 2 sin² (x)

By using graphical method of proving it is easy to see that the two graphs are identical therefore it proves that cos 2(x) = 1 - 2 sin² (x)

By Apolinario "Sam" Ortega, 19 January 2013, Created with GeoGebra

Cos (2x) Identity Sine (2x) Identity Tan x Identity Cos ² (x) + Sin ² (x) Identity

2 Tan ² (x) Identity Cos ² (x) Identity Cot 2x Identity

Cos x / (1-Sin x) Identity

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