- If x cosA= y sinA=k and x cosB+y sinB=k then prove that. x=y cot[(B+A)/2]?

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Calculate the molarity (M) of 159.8 g of H2SO4 in 1.165 L of solution.
Express your answer to four significant figures.? Find an equation of the tangent line to the graph of the function at the given point? y=e^sinh(x), (0,1)? What is a force pair in physics? Why cant an object in the universe be truly weightless? If I have 14 what would be a 68 percent increase of it?

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