C, means a return to zero, clearing the current calculation.
In, for calculating the natural logarithm (base e).
Log, for calculating the common logarithm (base 10).
E, a natural constant, is an infinite non-repeating decimal and is a transcendental number, and its value is about 2.718281828459045. It is the base of the natural logarithm.
E^ is the power, for example, 2^3 means 2 to the third power.
INV means "inverse" and is used to inverse trigonometric functions on calculators, such as sin30°=0.5; then invsin⁻¹(0.5)=30°.
DEG is the abbreviation of Degree, which means the angle system, that is, a circumferential angle is divided into 360 parts, and each part is expressed as 1 degree.
RAD is the abbreviation of Radian, which represents the radian system, that is, a circumference angle is equal to the unit circumference 2π with a radius of 1, and the angle size corresponds to the real number. The conversion relationship with DEG is 360°=2π RAD.
