(7) Find the equation of the tangent line at (7, 0). For y = sin (sinx) (8) Implicit Differentiation problem -- If y cos(x) + x =5 find y" where x = 0. (MUST use implicit differentiation approach for credit) (9) Suppose 4x2 + y2 = 25 (a) If dy/dt = 1/3. Find dx/dt when x = 2. Note: x and y are length in meters (b) if dx/dt = 3, find dy/dt when x = -1, Note: Both x and y have negative values. (10) Find the limit or show it does nor exist (DNE). lim 2x5-x-2 X--00 x4+3