- Use sum to product formulas for sin(x+5pi/2) + sin(x-pi/2)?

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What is 10x10x10x10? Prove that for all n>=9 that there exist natural numbers x,y s.t. n=2x+5y.? Is 1g NaCl tablet that can be bought in drugstores the same as 1g NaCl powder? Whats 49 over 64 in simplest form? Find the volume of the solid formed if the area bounded by y=4x-x^2 and this x-axis is revolved around the y-axis?