Homework Help: math

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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