Suna hai ki pahle determinant nikalo, phir har element ke cofactor ke sign checkerboard jaise lagao — par yaad rahe, plus-minus ka khel dimag ghumata hai. Mujhe to linear algebra mein yahi signs galat ho gaye the, isliye subject hi fail ho gaya. Ab to main kahta hoon ki agar cycle ke puncture ka hisaab itna aasaan hai, toh matrix kyun itna kathin bana diya gaya hai?
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