How do you find the value of tan (-135) ? Trigonometry Right Triangles Trigonometric Functions of Any Angle 1 Answer Rafael Oct 17, 2015 tan(225°)=1 Explanation: -135° is coterminal with 225° tan(-135°)=tan(225°) 225° is a special angle. tan(225°)=1 Answer link Related questions How do you find the trigonometric functions of any angle? What is the reference angle? How do you use the ordered pairs on a unit circle to evaluate a trigonometric function of any angle? What is the reference angle for 140^\circ? How do you find the value of cot 300^@? What is the value of sin -45^@? How do you find the trigonometric functions of values that are greater than 360^@? How do you use the reference angles to find sin210cos330-tan 135? How do you know if sin 30 = sin 150? How do you show that (costheta)(sectheta) = 1 if theta=pi/4? See all questions in Trigonometric Functions of Any Angle Impact of this question 6898 views around the world You can reuse this answer Creative Commons License