Mathematics, 01.02.2021 06:50 hobbs4ever1

HELP I DONT KNOW AND GIVE ME AN EXPLANATION PLZ Explain why the value of [cos θ,sin θ]• [cos(90 + θ),sin(90 + θ)] is independent of θ.

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HELP I DONT KNOW AND GIVE ME AN EXPLANATION PLZ Explain why the value of [cos θ,sin θ]• [cos(90 + θ...