Table of Contents
Welcome to cos 685°, our post aboutthe cosine of 685 degrees.
For the cosine of 685 degrees we use the abbreviation cos for the trigonometric function together with the degree symbol °, and write it as cos 685°.
If you have been looking for what is cos 685°, or if you have been wondering about cos 685 degrees in radians, then you are right here, too.
In this post you can find the cos 685° value, along with identities.
Read on to learn all about the cos of 685°.
Cos 685 Degrees
If you want to know what is cos 685 degrees in terms of trigonometry, then navigate straight to the explanations in the next paragraph; what’s ahead in this section is the value of cos 685°:
cos 685° = 0.81915
cos 685 degrees = 0.81915
The cos of 685 degrees is 0.81915, the same as cos of 685 degrees in radians. To obtain 685 degrees in radian multiply 685° by $\pi$ / 180° = 137/36 $\pi$. Cos 685degrees = cos (137/36 × $\pi)$.
Our results of cos685° have been rounded to five decimal places. If you want cosine 685° with higher accuracy, then use the calculator below; our tool displays ten decimal places.
To calculate cos 685 degrees insert the angle 685 in the field labelled °, but if you want to calculate cos 685 in radians, then you have to press the swap unit button first.
Calculate cos [degrees]
The identities of cosine 685° are as follows:
= sin (90°+685°) = sin 775°
= sin (90°-685°) = sin -595°
-cos685°
= cos (180°+685°) = cos 865°
= cos (180°-685°) = cos -505°
There are more formulas for the double angle (2 × 685°), half angle ((685/2)°) as well as the sum, difference and products of two angles such as 685° and β.
You can locate all of them in the respective article found in the header menu. To find everything about cos -685° click the link. And here is all about sin 685°, including, for instance, a converter.
In terms of the other five trigonometric functions, cos of 685° =
- $\pm \sqrt{1-\sin^{2} 685 ^\circ}$
- $\pm\frac{1}{\sqrt{1 + \tan^{2} 685^\circ}}$
- $\pm\frac{\cot 685^\circ}{\sqrt{1 + \cot^{2} 685^\circ}}$
- $\frac{1}{\sec 685^\circ}$
- $\pm\frac{\sqrt{\csc^{2} 685^\circ – 1} }{\csc 685^\circ}$
As the cosine function is the reciprocal of the secant function, 1 / sec 685° = cos685°.
In the next part we discuss the trigonometric significance of cos685°, and there you can also learn what the search calculations form in the sidebar is used for.
What is cos 685°?
In a circle with the radius r, the horizontal axis x, and the vertical axis y, 685 degrees is the angle formed by the two sides x and r; r moving counterclockwise is the positive angle.
As detailed in the unit-circle definition on our homepage, assumed r = 1, in the intersection of the point (x,y) and the circle, x = cos 685°.
Note that you can locate many terms including the cosine685° value using the search form. On mobile devices you can find it by scrolling down. Enter, for instance, value of cos685°.
Along the same lines, using the aforementioned form, can you look up terms such as cos 685° value, cos 685, cos685° value and what is the cos of 685 degrees, just to name a few.
Given the periodic property of cosine of 685°, to determine the cosine of an angle > 360°, e.g. 1405°, calculate cos 1405° as cos (1405 Mod 360)° = cosine of 685°, or look it up with our form.
Conclusion
The frequently asked questions in the context include what is cos 685 degrees and what is the cos of 685 degrees for example; reading our content they are no-brainers.
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– Article written by Mark, last updated on February 17th, 2017