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Explore the Back-StoryTry this beautiful problem from the Pre-RMO, 2017 based on Trigonometry & natural numbers.

Let f(x) = for all real x, find the least natural number x such that for all real x.

- is 107
- is 60
- is 840
- cannot be determined from the given information

Trigonometry

Least natural number

Functions

Answer: is 60.

PRMO, 2017, Question 11

Plane Trigonometry by Loney

here f(x) =

period of is

period of is

Lcm= .

- https://www.cheenta.com/rational-number-and-integer-prmo-2019-question-9/
- https://www.youtube.com/watch?v=lBPFR9xequA

Try this beautiful problem from the Pre-RMO, 2017 based on Trigonometry & natural numbers.

Let f(x) = for all real x, find the least natural number x such that for all real x.

- is 107
- is 60
- is 840
- cannot be determined from the given information

Trigonometry

Least natural number

Functions

Answer: is 60.

PRMO, 2017, Question 11

Plane Trigonometry by Loney

here f(x) =

period of is

period of is

Lcm= .

- https://www.cheenta.com/rational-number-and-integer-prmo-2019-question-9/
- https://www.youtube.com/watch?v=lBPFR9xequA

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