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Cofunction

functions with a sum of 90*

Cofunction Identities

Sin A= cos (90*-A)

Sec A= csc (90*-A)

Tan A= cot (90*-A)

Cos A= sin (90*-A)

Csc A= sec (90*-A)

Cot A= tan (90*-A)

Sec A= csc (90*-A)

Tan A= cot (90*-A)

Cos A= sin (90*-A)

Csc A= sec (90*-A)

Cot A= tan (90*-A)

30** 60** 90* Triangle

30-90: root three

90- 60: 1

60- 30: 2

90- 60: 1

60- 30: 2

45** 45** 90* Triangle

45- 45: root two

45- 90: 1

45- 90: 1

Reference Angle

The positive acute angle made by the terminal side of the angle and the x-axis