Two vectors have equal magnitudes

MATHEMATICS · Single correct · AP · AP Precalculus · Functions with Parameters, Vectors, and Matrices · Functions with Parameters, Vectors, and Matrices

Problem

Two vectors have equal magnitudes. For which of the following angles θ\theta between them will their dot product equal the square of the common magnitude? (a) 60∘60^\circ (b) 0∘0^\circ (c) 90∘90^\circ (d) 180∘180^\circ

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