Arrey, principal values ka tension mat lo yaar — sin inverse is [-π/2, π/2], tan inverse bhi wahi, but cos inverse is [0, π]. Teacher says it’s because cosine is positive in first quadrant and negative in second, so range 0 to π covers all values without repeating. Par honestly, mera dimaag ise aise samajhta hai jaise meri synth ki wiring — ek taraf se sahi lagta hai, but monsoon mein paani ghusa toh sab ulat-pulat ho jayega! Boards ke liye ratt lo, warna pappa phir government job ki baat karenge.
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