The formula of 1. trigonometric function: the basic relationship between sine, cosine and tangent functions, such as sin 2 (x)+cos 2 (x) = 1, tan(x)=sin(x)/cos(x), etc.
2. Quadratic function formula: the standard form of quadratic function Y = AX 2+BX+C, where A, B and C are constants, and the vertex coordinate formula (-B/2A, 4ac-B 2/4A).
3. Triangle area formula: According to Helen's formula, the area of a triangle is S=√[p(p-a)(p-b)(p-c)], where A, B and C are three sides of the triangle, and P is the half circumference, that is, (a+b+c)/2.
4. Formula of area and perimeter of a circle: the area of a circle is a = π r 2, and the perimeter of a circle is C=2πr, where r is the radius of the circle.
5. Derivative formula: When calculating the derivative of a function, the basic derivative formulas include derivative formulas of constant, power function, exponential function, logarithmic function and trigonometric function.
6. Integral formula: When calculating the integral of a function, the basic integral formulas include the integral formulas of constant, power function, exponential function, logarithmic function and trigonometric function.
7. trigonometric identities: such as sine theorem sinA/a=sinB/b=sinC/c, cosine theorem COSA = (b 2+c 2-a 2)/(2bc), pythagorean theorem A 2+b 2 = c 2, etc.
8. Probability formula: The basic formulas of probability include addition rule, multiplication rule, conditional probability, independent event, etc.
The above are just some important formulas in high school mathematics. Students need to master more formulas and theorems in the learning process to deal with various mathematical problems.