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1.
Half Angle Formula of Sine
$\sin \dfrac{\alpha}{2} = \pm \sqrt{\dfrac{1-\cos\alpha}{2}}$
Half angle
Trigonometry
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Most Important Formulas
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Sum to product
Product To Sum
Power of trigonometric functions
Two - dimensional coordinate system
Line in plane
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Ellipse
Hyperbola
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Derivatives of Composite Functions
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