First, the formula of the degree of crime
1、sin 30= 1/2
2, sin 45= root number 2/2
3.sin 60= root number 3/2
Second, cos degree formula
1, cos 30= root number 3/2
2, cos 45= root number 2/2
3、cos 60= 1/2
Third, Tandu formula
1, tan 30= root number 3/3
2. Tan 45= 1
3, tan 60= root number 3
Correlation formula:
1.sinh- 1x dx = xSinh- 1x-+c。
Second, cosh-1xdx = xcosh-1x-+C.
Three. TANH- 1x dx = XTANH- 1x+LN | 1-X2 |+c
Four. coth- 1x dx = xcotth- 1x-ln | 1-x2 |+c。
Verb (abbreviation of verb) sech-1xdx = xsech-1x-sin-1x+C.