Question

71. Find the value of tan (-405°)
(A) 1 (B) -1
(C) infinity (D) 0​

Answer 1

Answer:

tan (-405°) = -1

Step-by-step explanation:

Since angles look the same every 360 degrees, we can add and/or subtract 360 to get the argument of the tan() function into range (or, a good calculator will automatically do this for you, make sure you have it set to "deg" mode):

-

tan(-405) = tan(-405+360) = tan(-45) = -1

-

By convention, angles are measured as a rotation from the positive x-axis with counterclockwise rotations considered to be positive angles.