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# What is the value of SIN15 degree and COS15 degree.....?

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Hi rowanwah

The sine of an angle is only applicable is a right triangle. If you just want a number, ie, the actual value of the sine 15 degrees you can look it up on Google. Do a search for "sine and cosine functions"

If you want the mathematical description of the sine of an angle it is described as follows
In a triangle ABC, there are 3 angles angle A, angle B and angle C. There are also 3 sides, Side AB, Side AC and side BC. The sine of angle A is equal to the side opposite Angle A divided by the Hypotenuse (the longest side opposite the right angle)
The Cosine of angle A is equal to the side adjacent to Angle A divided by the hypotenuse

Hope this helps Loringh PS Please leave a rating for me Thanks

Posted on Nov 17, 2008

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Sin15 =sin(45-30) = sin45.cos30 - cos45.sin30
[ It is in the form of sin(A-B), so sin A. cosB - cosA. sinB]

1. =1/1.414 .1.7321/2 - 1/1.414 .1/2
2. =0.5175947
3. so cos 15 is also same prosiger

Posted on Dec 05, 2008

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Posted on Jan 02, 2017

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### Sin 43 degrees 30'

Press SIN 4 3 2ND [ANGLE] 1 3 0 2ND [ANGLE] 2 ENTER

2ND [ANGLE] 1 gives you the degrees symbol, 2ND [ANGLE] 2 gives you the minutes symbol. If you need seconds, use ALPHA ["] (on the + key).

Note that this usually won't give you an EXACT value, but only a ten-digit approximation.

Dec 05, 2012 | Texas Instruments TI-84 Plus Calculator

### A scalene triangle has side measuremnts a=43, b=55, c=30 . Angle a plus Angle b must equal 43. Angle b plus Angle c must equal 55. Angle c plus Angle a must equal 30.

Answer: angle a=9 degree angle b=34 degree angle c=21 degree Explanation: we have, a+b=43............(1) c+b=55..............(2) c+a=30..............(3) from (3) we get, c=30-a...........(4) substituting value of c from (4) in (2) we get, 30-a+b=55.........(5) a+b=43..........(1) (5)-(1) give 30-2a=12 30-12=2a a=18/2=9 degree giving value of 'a' in (1) 9+b=43 b=34 degree similarly giving value of 'a' in (3) c+9=30 c=21 degree

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### How do i change the setting to degree?

Press [2nd][MODE] to enter the default setup screen. On the third line Radian, Degree, highlight degree and press ENTER. From then on, angle values will be interpreted as degree values.

Feb 26, 2012 | Texas Instruments TI-86 Calculator

### When i put in integrals to solve, the ti89 gives me an answer with pi / a degree(normally 180) i do not need pi anywhere in my answer. how do i change this?

You are not using the right units. The integrals of functions involving angles (trigonometric functions) that you find in tables and other refrerences are valid only for the natural angle unit which is the radian. With any other angle unit (degree, gradian) there is a scale factor to take into account. That is the factor yoy are complaining about.

If it were not the case, the same integral will have two different values depending on the unit you use: and that cannot be.

If you want the calculator to give you the standard integrals in reference tables you must set the default angle unit to be radian.

Let x_deg be an angle in degrees and x_rad the corresponding value in radians.
calculating the differentials of bot sides you obtain

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### I get the wrong answers when i'm trying to calculate sinus tasks. ex: sin 41 = -.9165215479 and the right answer is: 0.66 why?

I have no idea where you got that particular value of a sin (41).
At first I thought you might have been using the radian as angle unit, but that is not the right answer. I tried cos (41 radian) and I got -0.9877392775.

Any way, when you are using angles you must select that appropriate angle unit ( appropriate to your problem, that is).

I suspect you need the angle unit to be set to degrees. If you do you will find that sin (41 degrees)=0.656059029 which is close to the rounded up value you call the "right answer".

To set the angle unit to degrees
1. Turn calculator ON
2. If you see no icones, press the [MENU] key.
3. Use arrows to highlight the RUN icon or press 1.
4. In RUN screen, press [SHIFT][MODE] to enter the (SetUp)
5. Press the down arrow 4 times to move highlight to the line Angle.
6. From the three tabs that appear at the bottom of the screen, select the one labeled Deg ( by pressing the F1 key) and press [ENTER.]
7. Calculate the sine with the angle unit set to degree and you will get the value you are expecting.

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### Wrong trig ratio

Your calculator is set in radians. Press mode key. Arrow down to 3rd line. Highlight degree and press enter. Your calculator is now in degrees, not radians. To get out of the mode screen and back to home screen, press 2nd and then mode.

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### Help

Simple 0.5(cos15 + (squer of 3).sin 15) =0.5(cos15+(3x3).Sin15) =0.5(0.9659+9x0.2588) =0.5(0.9659+2.3292) =0.5x3.2951 =1.64755 Zulfikar Ali ali_zulfikar@yahoo.com 989980221

Mar 09, 2009 | Super Tutor Trigonometry (ESDTRIG) for PC

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