Math Is Fun Forum

Peaches47

Member

Registered: 2008-02-17

Posts: 13

Dont Know How to Use the Calulator to find the value

Use  a calculator to find the value of the expression rounded to two decimal places.

             cos-¹(-√ 3/3)

a) -35.26                   b)125.26             c) -0.62                  d)2.19

I set my calculator to radian measures and put the problem in exactly as its stated i get: 

sin-¹(√3/3)+ pi/2

Now what am I to do with this?

If I set my calculator to degrees  I get this:

90(sin-¹(√3/3) pi/90+pi)

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Struggling Middle Aged Math Student

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: Dont Know How to Use the Calulator to find the value

Which calculator are you using?

If you use Windows scientific calculator, you should try this sequence:

The answer is (b) in degrees and (d) in radians.