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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)]

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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 special about z angles?

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


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.

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 Quadrantal triangle?

A quadrantal triangle is a type of triangle in which one of its angles measures exactly 90 degrees, while the other two angles are each 45 degrees. This specific configuration results in an isosceles right triangle, where the two legs are of equal length, and the hypotenuse is the longest side. Quadrantal triangles are often used in trigonometry and geometry due to their unique properties and relationships between their angles and side lengths.


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 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.


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 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.


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.


WHAT ARE THE PRINCIPLE OF TRIGONOMETRY?

The principles of trigonometry revolve around the relationships between the angles and sides of triangles, particularly right triangles. Key concepts include the sine, cosine, and tangent functions, which relate the angles to the ratios of the lengths of the sides. Additionally, the Pythagorean theorem establishes a fundamental relationship between the sides of a right triangle. Trigonometry is also essential in studying periodic phenomena, such as waves and oscillations, through its functions and identities.