- Give the exact value of the expression without using a calculator. cos(arctan(-7))?

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Put the following equations into an augmented matrices form:
5x + 8y = 15
2x – 4y = 5? Hi can anyone recommend me a STEM topic related to chemistry for my research? Something that is important and easy to research. Thanks.? The cerebrum of humans is larger compared to the cerebrum of animals. what advantages dies this give to humans? Point charges of 5micro and -3micro charge are placed 0.250m apart.Where can a third charge be placed so that the net force on it is zero? Which is not an acceptable value for the principle quantum number if n = 2.0? 1 -1 0 2.0 -2?