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4 a. Use the function "fminsearch" to find the values of x, y, and z that maximizes the function f(x, y,z) - sin(x + 2y + 3z)e maximum value of f at these values for x, y, and z'? Hint: When using "Eminsearch", try different random starting guesses for x, y, z between -5 and +5 b. Use the function "fminbnd" to find the value of x that minimizes the function g(x)-sin(x2 + 4)cos(x) in the interval [0,3]. Plot g(x) over this interval to check your answer What is the minimum value of g(x) in this +'). What is the (x2+y2+z2) interval