Calculator+ Variable, Equation, Function!

Calculator+ Variable, Equation, Function+ Basic operators: +, -, * (multiply), / (divide)+ Exponentiation operator: ^+ Negation: unary -+ Assignment: =+ Square root function: sqrt()+ Absolute value function: abs()+ Log functions: log(), log2(), ln(), exp()+ Transcendental functions: sin(), cos(), tan(), asin(), acos(), atan(), sinh(), cosh(), tanh(), asinh(), acosh(), atanh()+ Rounding functions: ceil(), floor(), round(), trunk()+ Angular conversion functions: dtor(), rtod()+ Constants: pi