Arranging the terms of a polynomial from large to small according to the exponent of a letter is called the descending power of the letter. For example, ab+(-2ba)+a is the power of A, and the algebraic expression formed by adding several monomials in mathematics is called polynomial (if there is subtraction, subtracting a number is equal to adding its inverse).

Calculation method of power reduction Power reduction formula: (COSA) 2 = (1+COS2A)/2

(Sina) ∧2=( 1-COS2a)/2

X to the n power. X is the base and n is the power (so it is also called the power of X).

Only items with the same power of n can be mixed. The purpose of reducing power is to reduce the value of n, which is convenient for operation.

Polynomials In mathematics, polynomials refer to expressions obtained by addition, subtraction, multiplication and power operation (non-negative integer power) of variables and coefficients.

More broadly, the sum of 1 or 0 monomials is also a polynomial. According to this definition, polynomials are algebraic expressions. In fact, there is no theorem that is valid only for narrow polynomials but not for monomials. When 0 is a polynomial, the degree is defined as negative infinity (or 0). Monomial and polynomial are collectively called algebraic expressions.

Items without letters in polynomials are called constant terms. For example, 6 in 5X+6 is a constant term.