„Hornafræði“: Munur á milli breytinga
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Lína 4:
Hornafallareglur:
:<math>\sin \left(x+y\right)=\sin x \cos y + \cos x \sin y \,</math>
:<math>\cos \left(x+y\right)=\cos x \cos y - \sin x \sin y \,</math>
:<math>\sin \left(x-y\right)=\sin x \cos y - \cos x \sin y \,</math>
:<math>\cos \left(x-y\right)=\cos x \cos y + \sin x \sin y \,</math>
:<math>sin^2(x) + cos^2(x) = 1</math>
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