đ Theory: Multiples/Submultiples Identities
Common formulas:
\(\sin 2x = 2\sin x\cos x\)
\(\cos 2x = \cos^2 x - \sin^2 x\)
\(\sin \frac{x}{2} = \pm \sqrt{\frac{1 - \cos x}{2}}\)
\(\cos \frac{x}{2} = \pm \sqrt{\frac{1 + \cos x}{2}}\)
Identity:
sinâŻ2x
cosâŻ2x
sinâŻ(xâ2)
cosâŻ(xâ2)
Angle x (degrees):
30
°
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