- Mathematics questions help please!!!?

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Find the exact value of the equation in the interval [0, 2pi) 4sin(x)Cos(x)=1? 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? What is the difference between absolute maxima and relative minima? Hi can anyone recommend me a STEM topic related to chemistry for my research? Something that is important and easy to research. Thanks.? What is the solutions for these two problems??? Can anyone help me?