- Calculus Homework: Help for #12 please?!?

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How many feet are on 22 metros? A=8a=8 , b=8b=8 and ∠C=140∘∠C=140∘. Find the length of side cc and measures of the angles, ∠A∠A and ∠B∠B (in degrees? Show that the set A={n^2 +n+1:n∈N}is infinite countable? A steel cable at 33 m mass 130 kg
is connected to two poles. Tension 4,238 N and the cable vibrates with a frequency of 2 Hz. Calculate the wavelength of the resulting wave on the cable.? Identify the maximum and minimum values of the function y = 8 cos x in the interval [-2π, 2π]?