answersLogoWhite

0


Best Answer

cos(195) = cos(180 + 15) = cos(180)*cos(15) - sin(180)*sin(15)

= -1*cos(15) - 0*sim(15) = -cos(15)

= -cos(60 - 45)

= -[cos(60)*cos(45) + sin(60)*sin(45)]

= -(1/2)*sqrt(2)/2 - sqrt(3)/2*sqrt(2)/2

= - 1/4*sqrt(2)*(1 + sqrt3) or -1/4*[sqrt(2) + sqrt(6)]

User Avatar

Wiki User

10y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: Cos 195 degree use the trigonometry functions of quadrantal angles and special to find the exact value?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Continue Learning about Other Math

What is a non quadrantal angle?

A quadrantal angle is one that in 0 degrees, 90 degrees, 180 degrees, 270 degrees or 360 degrees (the last one being the same as 0 degrees). These are the angles formed by the coordinate axes with the positive direction of the x-axis. All other angles (in the range 0 to 360 degrees) are non-quadrantal


Can a triangle have sides of 5cm 6cm and 7cm?

Yes, it can. And if you do the math, some basic trigonometry, you can calculate the angles in the triangle.


What jobs require that you know trigonometry?

Architect, they need to know trigonometry functions, among others they utilize to find the size of unknowns parts of shapes. Surveyors, carpenters. Trig is not restricted to angles, it has huge applications in waves, and occurs frequently as solutions to certain common differential equations. It is needed by any job that uses math. Thus, all engineers need trig, and it would be beneficial to any person who pursues science.


What is the Contribution of Pythagoras to trigonometry?

Pythagoras discovered many of the properties of what would become trigonometric functions. The Pythagorean Theorum, a2 + b2 = c2 is a representation of the fundemental trigonometric identity sin2(x) + cos2(x) = 1. 1 is the hypotenuse of any right triangle, and has legs length sin(x) and cos(x) with x being one of the two non-right angles. With this in mind, the identity upon which trigonometry is based turs out to be the Pythagorean Theorum.


What is special about z angles?

They are always identical angles unless the bottom and top lines are not parallel!!!!

Related questions

What are trigonometry?

"IS" not "are"! The numerical study of angles and their functions.


What is a Function in Trigonometry?

There are two types of functions in trigonometry: there are functions that are mappings from angles to real numbers, and there are functions that are mappings from real numbers to angles. In some cases, the domains or ranges of the functions need to be restricted.


What is the function of trigonometry?

Trigonometry is the study of the relationships between the sides and the angles of triangles and with the trigonometric functions, which describe those relationships.


How you will define trigonometry?

the branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angles.


What does similarity have to do with trigonometry?

In geometry, similar shapes have the same angles. This means that the values of the basic trigonometric functions of these angles are the same.


When did angles first become known in trigonometry?

Angles were known before trigonometry. Trigonometry was the study of angles and their relationship to shapes.


What is the difference between calculus and trigonometry?

Calculus is the study of instantaneous and cumulitive growths of functions with respect to two or more variables. Trigonometry is the study of angles, specifically in triangles.


Can you find the reference angle of a quadrantal angle?

Yes. Quadrantal angles have reference angles of either 0 degrees (e.g. 0 degrees and 180 degrees) or 90 degrees (e.g. 90 degrees and 270 degrees).


What is a non quadrantal angle?

A quadrantal angle is one that in 0 degrees, 90 degrees, 180 degrees, 270 degrees or 360 degrees (the last one being the same as 0 degrees). These are the angles formed by the coordinate axes with the positive direction of the x-axis. All other angles (in the range 0 to 360 degrees) are non-quadrantal


What are the angles in trigonometry?

Angles in trigonometry are the same as any other angles. They are a measure of the separation between two lines which meet at a point.


How do you calculate the angles of a triangle using sinc functions?

One can learn how to calculate the angles of a triangle using sinc functions by enrolling in a pre-algebra, trigonometry, or algebra math class. These angles can be calculated by learning how to from a teacher proficient in mathematics and with one's own scientific calculator.


How did the Greeks consider trigonometry?

Trigonometry (from Greek trigōnon "triangle" + metron "measure") is a branch of mathematics that studies triangles, particularly right triangles. Trigonometry deals with relationships between the sides and the angles of triangles, and with trigonometric functions, which describe those relationships and angles in general, and the motion of waves such as sound and light waves. There are an enormous number of uses of trigonometry and trigonometric functions. For instance, the technique of triangulation is used in astronomy to measure the distance to nearby stars, in geography to measure distances between landmarks, and in satellite navigation systems. The sine and cosine functions are fundamental to the theory of periodic functions such as those that describe sound and light waves.