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Trigonometry
O-Level E Math
Pythagoras' Theorem
$$a^2 = b^2 + c^2$$
Sine Rule
$$\dfrac{\sin A}{a} = \dfrac{\sin B}{b}$$
Cosine Rule
$$a^2 = b^2 + c^2 - 2bc\cos A$$
Area of Triangle
$$\text{Area} = \dfrac{1}{2}ab\sin C$$
Formulas for the Singapore O-Level Elementary Mathematics syllabus