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