The most easy-to-use and advanced multi-featured scientific calculator out there This is the most easy-to-use and advanced scientific calculators out there with features including:log, sin, cos, tan, clear, sqrt, asin, acos, atan, pi, ln, ee, parenthesis, division, squares, multiplication, exponents, subtraction, power of ten, addition, del, modulus (%), and the ability to evaluate a whole expression.