CosA=b/c (that is, the adjacent side of angle A is greater than the hypotenuse);

TanA=a/b (that is, the opposite side of angle A is adjacent to the edge);

CotA=b/a (that is, the adjacent side of angle A is compared with the side);

SecA=c/b (that is, the hypotenuse of angle A is adjacent to the edge);

CscA=c/a (that is, the hypotenuse of angle a is compared with the edge);

Sina Sina+sinBsinB = 1；

Sina/COSA = tana; tanA= 1/cotA

Extended data:

Characteristics of right triangle:

1, the sum of squares of two right angles of a right triangle is equal to the square of the hypotenuse. As shown in the figure, ∠ BAC = 90, then AB2+AC2=BC2 (Pythagorean theorem).

2. In a right triangle, two acute angles are complementary. As shown in the figure, if ∠ BAC = 90, ∠ B+∠ C = 90.

3. In a right triangle, the median line on the hypotenuse is equal to half of the hypotenuse (that is, the outer center of the right triangle is located at the midpoint of the hypotenuse, and the radius of the circumscribed circle R=C/2). This property is called the hypotenuse midline theorem of right triangle.

4. The product of two right angles of a right triangle is equal to the product of hypotenuse and hypotenuse height.

Baidu Encyclopedia-formulas of trigonometric functions