Q3: Develop an M-file function to determine the elapsed days in a year up to a specific date. The first line of the function should be set up as function nd = days (mo, da, year) where mo = the month (112), da = the day (1-31), and year = the year. Test it for January 1, 1997 (should return 1 for this day), February 29, 2008, May 15, 2016, and December 31, 2022. Hint: Use the "for" and "switch" structures in your program. Q4: The Maclaurin series expansion for cos x is cos x = 1 -+ 2.4! 68! Starting with the simplest version, cos x = 1, add terms one at a time to estimate cos After each new term is added, compute the true and approximate percent relative errors. Use your pocket calculator to determine the true value. Add terms until the error falls below 0.5%