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
Find the sum of the elements in the "second" diagonal
Free passes for everyone!
Matrix to column conversion
Are you in XY plane?
Element by element multiplication of two vectors
Create tangent function out of sin and cos
Freebies anyone? No!!!!
Create tangent function out of sine function only
Create sine function out of cosine
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