Trigonometry: Derived from two Greek terms, i.e., trigon (means a triangle) and metron (means measurement), it is the study of relationships between angles and sides of triangles.
Analysis: It is the branch that deals with the study of the rate of change in different quantities. Calculus forms the base of analysis.
kkkkkkkkkkkkkkkkkkkThe example of a GSTIN would go like this: 22AAAAA0000A1Z5, where 22 is the state code, which is Chattisgarh, AAAAA0000A is the PAN or the Personal Account Number, 1 is the entity number of the same PAN holder in a state, Z is the default alphabet and 5 is the checksum digit.