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Does sunscreen transmit, absorb, or reflect ultraviolet waves? Check that the differential equation (2xy+y^3)dx+(x^2+3y^2x)dy=0 is exact. Find the general solution. Then find the solution satisfy y(1)=2? What is the approximate value for the pressure drop caused by filter aids in a water purification system? Was Fred Hoyle right about the Big Bang? Alo ad ơi?