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Trigonometry Resources


Deriving Trig Identities with Euler's Formula

Using Euler's Formulas to Obtain Trigonometric Identities Written by tutor Jeffery D. In this lesson we will explore the derivation of several trigonometric identities, namely cos (x + y) = cos x cos y - sin x sin y and sin (x + y) = sin x cos y + sin x cos y also cos 2x = cos2 x - sin2 x along with sin 2x = 2 sin x cos x and lastly, DeMoivre's... read more

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