Discover Questions

I am having a hard time understanding the tangent line stuff. Can someone help me please? Thank you!? Determine the number of valence electrons in POCL3 and then draw Lewis structure with minimized formal charges.? For Mercury, about when did the cratering rate begin to decrease? If integral of f(x)dx where x=14 and x=11.5 equals 5. What is the integral of (1f(x)-3) where where x=14 and x=11.5 ? Find the absolute maximum and absolute minimum values of f on the given interval.
f(t) = 2cos(t) + sin(2t), [0, π/2]?