Question

g the value of tan(-150) is because -150 is in quadrant the reference angle is and the exact value of tan (-150) is

Answer 1

1/√3

Explanation:

Given the expression tan (-150), from trigonometry identity, tan(-θ) = -tanθ

Hence tan (-150) = - tan 150

First is to find the value of tan 150.

tan 150 = tan (180-30)

tan (A+B) = (tan180 - tan30)/1+tan180tan30

tan (180-30) = (0 - 1/√3)/1+0(1/√3)

tan (180-30) = -1/√3/1

tan (180-30) = -1/√3

Since tan 150 = -1/√3

-tan 150 = -(- 1/√3)

-tan 150 = 1/√3

Since -tan 150 = tan (-150) = 1/√3

Hence the exact value of tan (-150) is 1/√3