- Determine the value of cos (-53pi/12) using a double or half angle formula.?

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Is there any value of x with the property that x is less than x-1? Is there a vacuum out side the physical Universe? How many moles of NAOH are present in 11.5ml of 0.220 M NAOH? If f(y1, y2) = 1/k exp(-1/2 [(y1)^2 +(y2)^2 +2y1y2 - 22y1 - 14y2 +65] represents a bivariate normal density function. Find k? If an object that floats on the surface displaces 10cm3 of water, how much does that object weight?