1. Calculate the following by Matlab: sin(0.2π) Cos + tan72º Hint: π is pi in Matlab; use nthroot function. 2.1×106-15.2×105 3x √√6x1011 c+a 2. With Matlab, define the variables c=4.5, d=1.7, a=cd² and b, then evaluate: c-d' d+ (cd)² - cd-1 a 3. Given are 5x6 matrix A, a 3x6 B and a 9- element vector v. 258 11 14 17 3 69 12 15 18 A 47 10 13 16 19 58 11 14 17 20 5 10 15 20 25 30 B 30 35 40 45 50 55 v = [99 98 97 96 95 94 93 92 91] L55 60 65 70 75 80] L6 9 12 15 18 21- Create the three arrays in the Command Window, and then, by writing one command, Replace the last four columns of the first and third rows of A with the first columns of the first tow rows of B, the last four columns of the fourth row of A with the elements 5 through 8 of v, and the last four columns of the fifth row of A with columns 3 through 5 of the third row of B. You should have: A = 2 5 5 10 15 20 3 6 9 12 15 18 4 7 30 35 40 45 5 8 95 94 93 92 6 9 60 65 70 75