Question

Find all possible values for each expression.
tan-1 1

Answer 1

45 and 225degrees

Explanation:

Given the expression

tan⁻¹1

Using the calculator

tan⁻¹1

tan⁻¹1 = 45degrees

Since tan is positive in the third quadrant

theta= 180 + theta

theta = 180 + 45

theta = 225degrees

Hence the values of theta are 45 and 225degrees