- Knowledge of geography comes in handy in a war situation for which of the following reasons?

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How do I use de Moivre's formula to evaluate (cos pi/7 + i sin pi/7) ^7 in cartesian form? What is the mid line and amplitude of y = 5-4sin t / 5? What's the first digit of Pi? If you write 70,000 in scientific notation the coefficient will be 70 true or false? For what values of k is the following integral improper? upper bound is k, lower bound is 0. (x)/(x^2-19x+90)dx?