Please dont use cos(x) directly
True, but still not following the instruction. (Although not as shameless as some other submissions.)
Euler's formula is the most beautiful equation
Magic is simple (for beginners)
length of a vector
Square a Number
Basic commands - Least common multiple
Combine the digits to output numbers
Encode Me From The Past
Creating a code via test suite :)
Create tangent function out of cosine only
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