Tabulation method

method of images

Proportional function: y=kx(k is constant, k≠0)

When k>0, the image passes through one or two quadrants, and y increases with the increase of x.

When k < 0, the image passes through two or four quadrants, and y decreases with the increase of x.

Linear function: y=kx+b(k, b is constant, k≠0)

When b=0, y=kx+b = y=kx, so the proportional function is a special form of linear function.

Inverse proportional function: y=k/x(k is constant, k≠0)

Quadratic function: y=ax+bx+c(a, b and c are constants a≠0)

Acute trigonometric function:

Definition of sine: opposite side/hypotenuse of sine = ∠ a = a/c.

Cosine definition: adjacent side/hypotenuse of cosine = ∠ A = B/C.

Tangent definition: Tana =∠A the opposite side of ∠ A/the adjacent side of ∠ A = A/B.