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Find the exact value of cos(cos^-1(0.09))? What is the pH of a 0.27 M HNO2 solution? Ka = 4.50 ✕ 10-4.? In the equation E=mC^2 is the mass content of the motion displace at the speed of ligtht irrespective of the gravity field.? Anyone answer this thanks? Is there anything divisible by the product of zero?