Trigonometry

If the angles are the same and the sides are proportional by ratio then they are said to be similar triangles.

Sin, Cos and Tan is the formula for sine. A right-angled triangle is a triangle in which one of the angles is a right-angle. The hypotenuse of a right angled triangle is the longest side, which is the one opposite the right angle. The adjacent side is the side which is between the angle in question and the right angle.

The exact value of 60 degrees would be 1/2. This is a math problem.

The domain of cosine is all real numbers, its range is [-1,1], and its period is 2π radians.

You need to know the trigonometric formulae for sin and cos of compound angles.

sin(x+y) = sin(x)*cos(y)+cos(x)*sin(y)

and

cos(x+y) = cos(x)*cos(y) - sin(x)*sin(y)

Using these, y = x implies that

sin(2x) = sin(x+x) = 2*sin(x)cos(x)

and

cos(2x) = cos(x+x) = cos^2(x) - sin^2(x)

Next, the triple angle formulae are:

sin(3x) = sin(2x + x) = 3*sin(x) - 4*sin^3(x)

and

cos(3x) = 4*cos^3(x) - 3*cos(x)

Then the left hand side

= 2*[3*sin(x) - 4*sin^3(x)]/sin(x) + 2*[4*cos^3(x) - 3*cos(x)]/cos(x)

= 6 - 8*sin^2(x) + 8cos^2(x) - 6

= 8*[cos^2(x) - sin^2(x)]

= 8*cos(2x) = right hand side.

sin(3π/2) = -1

For a right angle triangle the trigonometrical ration is: tangent = opposite/adjacent

1/4 of 360 degrees = 90 degrees which is a right angle

The relationship between an angle and the triangle formed by it is always constant. This is also why sin cos and tan obtained from the unit circle can be applied to all triangles with the same angle. All that matters is the ratio of the sides, so the calculator can "pick" any length for one side, and use that and the angle to find the other side(s). This answer will be the same regardless of which triangle you are specifically referring to. Side lengths 3 and 5 will produce the same trig values as sides 21 and 35. Also, given the processing power of most calculators, these values are often programmed in, similar to how many students are "programmed" to know the trig values for major angles such as pi, pi/4, 30deg, and 60deg.

In a right triangle, its Opposite/Hypotenuse I always use: Soh (sin, opposite/hypotenuse) Cah (cosine, adjacent/hypotenuse) Toa (tangent, opposite/adjacent) Hope this helped! :)

Because if you construct a right triangle in which the acute angles are 30° and 60°,

you'll find that the side adjacent to the 60° angle is 1/2 the length of the hypotenuse,

which is how you apply the definition of the cosine.

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A calculator for trigonometry can be purchased from WalMart, Target, Staples, Best Buy, Amazon, eBay, Radio Shack, Engineer Supply, from an iTunes app, and from Web Crawler.

Some scientific caculators can convert degrees minutes and seconds into decimal degrees and vice versa as for example 60045'18'' = 60.755

Cut it out of a material whose weight per unit of area you know, weigh it, then divide the weight by the weight per unit of area.

An equilateral triangle has three equal sides and three equal angles. Each angle is 60 degrees.

Your question is insufficiently precise, but I'll try to answer anyway.

"Sine squared theta" usually means "the value of the sine of theta, quantity squared".

"Sine theta squared" usually means "the value of the sine of the quantity theta*theta".

The two are not at all the same.

The plicae circulares slow down the food passing along the intestines. Because of their shape there is an increase in the surface area between the food and the walls on the intestines which allows more efficient absorption of nutrients from the chyme - the stuff that comes from the stomach.

The answer is 3rd quadrant because 980 degree -720 degree =260 degrees so the 3rd quadrant is 180 degrees to 270 degrees

One example of an astronomer's use of trigonometry is determining the distance to a star by triangulation.

In math a normal absolute value equations share a vertex.

A right angle triangle has an hypotenuse which is its longest side, an adjacent side and an opposite side.

To get this answer, type in tan(28) in your calculator. It should come out to be about .532. Make sure your calculator is in Degree mode.

They are called trigonometricians.