- Prove that {e1, e2,..., en} is a basis of R^n?

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Multiply matrices A and B of any sizes legally (no size compatibility requirment). What kind of matrix multiplication am I? Differentiate(t) = (cos^3 t+ 3cost +7)^9? What is the purpose of blanching foods? What town is this prefix number for 869 ? Is it true that the oxidation number of an ion is equal to its protons subtracting its electrons?