4. " Repeat" problem 2 using an= n ! n 5. Determine the Maclaurin X - X for : a ) ; bixcos ( x* 3/2 ) ; C ) 1 - e arctan ( x 2 ) 1 - X 2 " d ) X x 2 je) In(1+ 3x?) ; f ) x sin ( 2X ) . 6. Use series to approximate sin ( x ) dx with error less than 106.+ 1 (an Jet an = ( 1) ( n ! )