How do you find the value of tan (-135)?

We have to find the value of tan -135 degrees

Solution

tan 105 can be expressed as

tan (-135)= tan (90 +45)

tan (- 135°) = – tan 135°

= – tan (1 × 90° + 45°)

= – (- cot 45°)

= 1

Answer

tan (-135°) = 1