contants
e :base of natural exponential function equal to approximately 2.71828
pi :constant equal to approximately 3.14159
operations
+ : addition
- : subtraction
* : multiplication
^ : exponentiation
/ : division
functions
sin(x) : sine function
cos(x) : cosine function
tan(x) : tangent function
cot(x) : cotangent fucntion
sec(x) : secant function
csc(x) : cosecant function
arcsin(x) : inverse of the sine function
arccos(x) : inverse of the cosine function
arctan(x) : inverse of the tangent function
ln(x) : logarithmic function base e
exp(x) : exponential function base e
abs(x) : absolute value function

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