Scalar Product & Angle Between Two Vectors [IB Math AA HL]

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This video covers the Scalar Product & finding the Angle Between Two Vectors. Part of the IB Mathematics Analysis & Approaches HL course in Topic 3, Geometry & Trigonometry

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im new to this topic but what if one vector is not following the format of Ai+Bj+Ck? Is that possible, if not, why must it always be in this format? What if it is not in this format then is there another way to use the formula or other methods?

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