15. DETAILS LARCALC11 2.3.097. Find the second derivative of the function. f ( x ) = x sin(x) f " (x ) = 16. DETAILS LARCALC11 2.3.100. Find the second derivative of the function. f( x ) = CSC x f "(x) = 17. DETAILS LARCALC11 2.3.102. Find the given higher-order derivative. F ( 3) ( x ) = 4 x3, F(4) (x ) f ( 4 ) ( x ) =13 DETAILS LARCALC11 2.3.075. Determine the points at which the graph of the function has a horizontal tangent line. f( x ) = _ x 2 x - 1 (x, y ) = (smaller x-value) ( x, y ) = (larger x-value) 14. DETAILS LARCALC11 2.3.093. Find the second derivative of the function. F(x) = 7x3/2 f "(x ) =12. DETAILS LARCALC11 2.3.064. Consider the equation and the given point. A(x) = (x - 3)(x