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How do i calculate cos 30°24' - Casio FX-300MS Calculator

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You must first set angle unit to degree.
Press the [MODE] key a certain number of times until you get to a screen that displays Deg Rad Grad. Press number key 1 to select degree.
Once this is done you can calculate trigonometric functions. To enter angles in DMS you have a key marked with degree symbol, a quotation mark, and a double quotation mark. In what follows that key is represented as DMS.

To calculate cos(30 deg 24')
[COS] 30 [DMS] 24[DMS] [=]

If you get an error message you will have to enter the seconds even if the value is 0
[COS] 30 [DMS] 24[DMS] 0 [DMS] [=]

Posted on Sep 11, 2010

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Posted on Jan 02, 2017

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SOURCE: I am trying to find the angle of a right triangle

cos A = adjacent/hypotenuse = 19/24

A = Inverse cos (19/24) = 37.66

P.S. Also, make sure your calculators settings is in degrees (not radians or grads)

Posted on Jun 24, 2011

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SOURCE: Find cos 32° 45'

Hello,
Look at the column of keys under the ALPHA key. You have the integral, the square root, and then the key that has a degree sign, an apostrophe and a double closing quotation mark. That is the one you use to enter the angle in sexagesimal notation. To simplify my task I will symbolize the key with [DMS], degree, minute , second.
To calculate cos (32° 45')
you press
[COS] 32[DMS]45 [DMS] ) and press [=] The result si 0.841039013
Hope it helps.

Posted on Nov 14, 2009

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Sin, cos,tan don't work. For example, I click 1, 2nd and cos and I'm getting 1 instead of 0.54. In all other buttons the 2nd function is working but not for sin, cos, tan. Thanks for any help!


I wonder if your calculator is set to the wrong units. Your calculator can be set to degrees, radians, or gradians. I assume that you want it set to degrees.

When I click 1 2nd and cos, I will always get 0, because using the 2nd before the cos turns the function into cos^-1 (inverse cosine). The inverse cosine of 1 is 0 because the cosine of 0 is 1.

Good luck.

Let me know if you have any further questions.

Paul

https://education.ti.com/en/us/guidebook/details/en/ADF11FB65B284B6195B0A7E9502784BA/baiiplus

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Find the derivitive of sin(cosx)


The 9750GII doesn't have symbolic capabilities so it can't give you a symbolic answer for this. It can evaluate it numerically at any point.

The derivative of sin(cos(x) dx is cos(cos(x))-sin(x).

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Derivatives


The derivative of sin(cos(x)) dx is cos(cos(x))-sin(x). Unfortunately the fx-9850GII doesn't do symbolic differentiation so you'll have to get this result some other way. I cheated and used a calculator from another manufacturer, one that does do symbolic differentiation.

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To calculate the Cosine of an angle, you first make sure that the angle unit on your calculator is set to the correct one (degree, or radian). After that it is all simple. Enter the angle value (50 degrees) then press the [COS] key. If you get an error then press the COS key followed by the angle value then press =.
Note if your calculator display Cos ( , with a left parenthesis, then you have to press COS first followed by the angle value and possibly the right parenthesis.
Note. The theta here is of no relevance.

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How to solve for the trigonometric functions in the casio scientific calculator?


Press the relevant function key [SIN],[COS],[TAN] followed by the angle value.
For inverse trigonometric functions [SIN^-1], COS^-1], or [TAN^-1], Press [SHIFT][SIN], [SHIFT][COS], or [SHIFT][TAN].
For other functions
sec(x)=1/cos(x)
csc(x)=1/sin(x)
cot(x)=1/tan(x)

When calculating trigonometric functions one must make sure that the angle unit the calculator is using is the correct one.

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Why the cos of 90 is -0.44... ?? and the tan sin its'nt correct in the calculator what can i do ?


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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1 Answer

It only says cos( a few times and wont do anything else


Hello,
What do you do when it displays cos( ?

You have pressed the key [cos], it echoes on the screen as cos( . The opening parenthesis signals to you that it is waiting to know the angle the cosine of which you want to calculate.

If that is not what you want to do, press [CLEAR] to erase the command and do something else.
If not, enter the value of an angle, 45, press the ) then [ENTER]

[cos] 45 [)] [ENTER] , you get .7071067812.

If the calculator seems to be doing nothing, press [2nd][QUIT][ENTER] and it will interrupt what it was (not) doing, and give you access to the calculator screen.
It would be an inspired idea to take a look at the first few chapters of your calculator manual to learn the basics about how to handle the calculator.

Hope it helps.

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1 Answer

How do i find inv for sin,i have tried the mode Deg 1 but i keep getting the wrong answer. can you help? Eg 0.6339869 INV cos ans should be 50.655113.


You didn't specify what calculator you have.

On my TI30XA, 0.6339869 '2nd' 'COS-1' gives 50.655114
On my Windows XP calculator, 0.6339869 'Inv' 'cos' gives 50.655114
On a Casio FX-300ES, 0.6339869 'Shift' 'cos-1'

I hope one of these helps. If not, let me know what calculator you have and I'll figure it out.

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This is a trigonometry problem not a calculator's.
cos(x) +tan(x).sin(x) = ( cos(x) + (sin(x)/cos(x)).sin(x). After reduction to the same denominator (which is cos(x)) you obtain

{cos(x).cos(x) + sin(x).sin(x)} divided by cos(x).
The content of the bracket above is just 1.
Your fraction will have 1 as numerator and cos(x) as denomitor. That is exactly the definition of the secant function i.e. Function sec is the reciprocal (not the inverse) of the cos function, while the arccos is the inverse of cos.

A mild advice: Avoid writing function without specifying the argument (the variable on which a function acts).

Note:

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1 Answer

Cos A + 4.37/7.25 I cannot figure how to solve


Here's how in 4 easy steps (I substituted "A" for "X", my more favorite variable.):

1.) Set calculator to "Degree"
2.) Given-- (cos( X))
3.) Given--(4.37/7.25)==> (437/725)
4.) Add--(cos( X)+ (437/725)

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