- Lim as x->pi/4 (sec^2x-2tgx)/(1+cos4x)?

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What is the final temp (in oC) when 20.0 g of water at 25°C is mixed with 30.0 g of water at 80.°C? Specific heat of water is 4.184 J/goC.? I went in for a procedure, a same day surgery. Dr found a tumor and im scheduled for surgery tomorrow. Does this mean its serious? What are the best and most advanced calculators for a student studying a math intensive major such as Mechanical Engineering? List of temperature in Memphis, Tennessee summer 1980? W^44 + w^45 = ? Options : A)-1 B)-1/w C) 1/(-w^2) or none.
I know that w^3 = 1 the answer is c...how?