sec (-A) = sec (A)
cos A= sen B
cos A sec A=1
cot^2 A + 1= csc^2 A
sen A csc A=1
sec A= csc B
sen A= cos B
tan A= cot B
cot A = cos A / sen A
tan^2 A + 1= sec^2 A
csc (-A) =- csc (A)
csc A= sec B
cot (-A) =- cot (A)
sen (-A) =- sen (A)
cos (-A) = cos (A)
sen^2 A + cos^2 A=1
cot A= tan B
tan (-A) =- tan (A)
Tan A = sen A / cos A
tan A cot A=1