Aare, start left side se: 1 + tan²A = 1 + (sin²A/cos²A). Ab common denominator lete hain: (cos²A/cos²A) + (sin²A/cos²A) = (sin²A+cos²A)/cos²A. Par sin²A+cos²A to 1 hota hai, na? Toh bachta hai 1/cos²A, which is sec²A. Bas ho gaya proof!
Yeh identity rat-ta hoon main garage ke kone mein, diya ki roshni mein, jab baarish dhapp-dhapp karti hai chhat par. Papa kehte hain "yeh sab kya karega?" — par yeh trigonometry ka har formula guitar ke suron ki tarah fit hona chahiye, bilkul exact. Isliye ek side se hi solve karna padta hai, waise hi jaise ek hi taar se sur nikalna padta hai shuru mein.
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