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In his circle, Das & Pal wasn’t just a textbook; it was a map through a minefield. The professors loved to pull "unsolved" problems from its deep chapters—problems that could break a student's GPA if they hadn't seen the specific logic behind them. Rohan had checked the library weeks ago, but every physical copy had been checked out, likely hidden under the mattresses of the top-rankers. engineering mathematics das pal vol 2a pdf download