Posted by **Anonymous** on Saturday, September 3, 2011 at 3:57pm.

Write the expression and evaluate. There should only be one answer which should match the range of the inverse trig function.

Sec^-1(-2)

sec^-1(-sqrt2)

Cos^-1((-sqrt3)/2)

Tan^-1(-sqrt3)

Could someone explain how to get the answer as well please.

- trig -
**Henry**, Monday, September 5, 2011 at 4:13pm
To limit the results to only one answer, the range must be limited to a

value between 0 and 180 degrees:

0 < A < 180.

secA = 1/cosA = -2,

cosA = -1/2,

A = 120 deg.

secA = 1/cosA = -sqrt2,

cosA = -1/sqrt2,

A = 135 deg.

cosA = -(sqrt3)/2,

A = 150 deg.

tanA = -sqrt3,

A = -60 deg.,CW = -60 + 180 = 120 deg.

## Answer this Question

## Related Questions

- trig - Write the expression and evaluate. There is only one answer whIch should ...
- trig - Write the expression and evaluate. There is only one answer whIch should ...
- trig 26 - simplify to a constant or trig func. 1. sec ²u-tan ²u/cos ²v+sin ²v ...
- Algebra II (check) - Assume that no denominator equals 0. sqrt12 - sqrt18 + ...
- trig - please help me with some questions I skipped on a review for our test ...
- Integration - Intergrate ¡ì sec^3(x) dx could anybody please check this answer. ...
- trig help much appreciated! :)) - 1. Find the complete exact solution of sin x...
- more trig.... how fun!!!! - if you can't help me with my first question hopw you...
- Algebra - Rationalize denominator, all variables positive real numbers and ...
- trig - how do you start this equation i've been tryng it for 20min. sec^6x(...