MATLAB has several types of built-in math functions that can help you perform common operations. a) Write the MATLAB code that takes the absolute value of -134. b) Write the MATLAB code that stores a number 3*pi in a variable named x, thern takes the cosine of x. c) Functions can also be applied to vectors. Assume you have a vector y, which contains the elements [4, 9, 16]. Write the MATLAB code to take the squareroot of y. What should the result be