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[16 points]) True-False questions: Decide if the following statements are true or false. Give Short and coherent argument for your choice. (11 a) The differential equation dey + cos(:r)y = 0 is separable. :c 2 0 0 b) The matrix 0 1 1 is invertible. 2 0 1 c) The differential equation @ + fwdy = 2:2. is linear. ah:2 d3: (1) The vectors (1,0,1), (2,1,1), (1,1,0) and (5,3, 1) form a basis for R3