et T E L(V,W), and U e L(W, X). Prove that UT : V → X is also linear

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A: We have,∫2x+1x2-9x+18dx=∫2x+1x2-3x-6x+18dx=∫2x+1xx-3-6x-3dx=∫2x+1x-3x-6dx