Range of cot−1 is (0,π). We need angle in this range with cotθ=−1/3. Now cot(2π/3)=cos(2π/3)/sin(2π/3)=(−1/2)/(3/2)=−1/3. So cot−1(−1/3)=2π/3.
A dishonest delivery man purchases 20 liters of pure milk and dilutes it by adding 4 liters of water. If he sells the diluted milk at Rs.50/L, then…
CUET UG 2023 — Mathematics Applied-Mathematics
2023mcqmedium
A dishonest delivery man purchases 20 liters of pure milk and dilutes it by adding 4 liters of water. If he sells the diluted milk at Rs.50/L, then what is the cost price of pure milk?
Official previous-year question
Held on 23 May 2023 · Verified 13 Jul 2026.
Options
- A
Rs.40/L
- B
Rs.58/L
- C
Rs.60/L
- D
Rs.62/L
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