- Use a half-angle formula to find the exact value of the expression. cos 3pi/8?

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How much potassium chlorate is needed to produce 2.75 L of oxygen, collected over water at 37 degrees Celsius and 94.9 kPa? No matter how much i practice maths, i keep forgetting the process and keep getting sums wrong. What should i do? How to get an it of a genius? Could the idea of calculating the area under a curve be expanded to the calculation of the volume of a sphere? Or a square to a cube? Thanks Ash, I could not for the life of me figure out how to figure just capacitance.?