Posted by **anonymous** on Thursday, January 7, 2010 at 9:59pm.

Evaluate.

1. sin^-1(-1/2)

2. cos^-1[(-root 3)/2]

3. arctan[(root3)/3]

4. cos(arccos2/3)

5. arcsin(sin 2pi)

6. sin(arccos 1)

I got these values as my answers:

1. -pi/6

2. 5pi/6

3. pi/6

4. 2/3

5. 2pi

6. 0

Can someone please tell me if they are right? thank you

- math -
**MathMate**, Thursday, January 7, 2010 at 11:22pm
The answers for inverse trigonometric depends on the range. Most of the time,

function range

asin(x) -π/2 to π/2

acos(x) 0 π

atan(x) -&pi/2 to π/2

Based on the above ranges, here are your answers:

1. -pi/6 correct

2. 5pi/6 correct

3. pi/6 correct

4. 2/3 correct

5. (2pi) 0

6. 0 correct

- math -
**anonymous**, Friday, January 8, 2010 at 1:00pm
Thank you MathMate.

- math :) -
**MathMate**, Friday, January 8, 2010 at 11:15pm
You're very welcome!

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