Question about Casio FX-115ES Scientific Calculator

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My calculator is not computing sin^-1 or cos^-1 correctly, I put sin^-1(0.184) in and it came out with 10.60283... when I should be getting 1.39. HALP?

I tried putting it in radian measure, but it just made the number bigger

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When the angle unit is in radians
sin^-1(0.184)=0.1850543940 radians
When angle unit is in degrees
sin^-1(0.185)=10.60283581
Your calculator is calculating the functions correctly)
In the following screen captures the sine of the values is calculated with the unit specified inside the formula (degree symbol and radian symbol are inserted to show you the unit). In the last calculation the value of the sine is practically 0.184
Remember that when angle is in radians, for very small angles (less than 10 degrees), sin(x) and tan (x) are about equal to the value of the angle in radians

My calculator is not computing sin^-1 or cos^-1 co - 0115ee6b-649e-45fc-824c-f8abe88bac58.png

Posted on Mar 25, 2014

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The arcsine of .184 is about .185 radians or 10.6 degrees (which your calculator seems to be giving you), while the arccosine of .184 is about 1.39 radians (which seems to be what you want) or 79.4 degrees.

To set radians mode, press SHIFT MODE 4.

To calculate the arcsine of .184, press SHIFT SIN . 1 8 4 =
What do you get? I get 0.185 .

To calculate the arccosine of .184, press SHIFT COS . 1 8 4 =
What do you get? I get 1.39 .

Posted on Mar 25, 2014

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SOURCE: sin, cos, or tan, on casio wrong answer. another cac right answer

Hello,
It may be due to the angle unit used. You can have angles in degrees, in radians, and in grads. You should set the default angle unit to waht you problem calls for.
To set degree as default SHIFT MODE 3
To set radians as default SHIFT MODE 4
To set grads as default SHIFT MODE 5

The values of angles calculated by the inverse trigonometric functions are in the default unit that is set . This may be the source of the wrong answers that you get.

Hope it helps.

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SOURCE: why the cos of 90 is -0.44... ??

The trigonometric function evaluations depend on the angle unit you are using: degree, radian, grad
While cos(90 deg)= 0,
cos(90 rad )=cos(90* 180/pi degrees)= -.448073616

ALWAYS CHECK UNITS before using trigonometric functions or their inverse functions.

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SOURCE: The Tan, Sin and Cos

Press [SHIFT] [MODE] [3] to switch to degrees.

Posted on Jan 10, 2011

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