- Prove that any two bases in R^n have the same number of vectors?

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Multiply matrices A and B of any sizes legally (no size compatibility requirment). What kind of matrix multiplication am I? Is three days enough to study for a calculous test? Differentiate(t) = (cos^3 t+ 3cost +7)^9? What the number degre of high acid? Find integers x and y such that 57x+79y=17, and 400