- Evaluate the expression sec(pi/6+2pi)?

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Need to find a and b such that x^4 - 8x^3 + 4x^2 + ax + b is a perfect square.? If 4^x - 4^(x-1) = 24, then x^(1/2) equals? Please demonstrate how to solve this problem. Round to four decimal places please. Thank you.? How many grams of HCl are required to produce 224 liters of Cl2 at STP? Whats the conjugate base of NO2-?