Trigonometry

the word Halloween came from the Celts who lived 2000 years ago

A secant is not a subdivision of a minute.

Plus One Mathematics question papers can be downloaded from different sites including the higher secondary board site.

Because that is accepted definition. The sine is opposite over hypotenuse, or Y in the unit circle. The cosine is adjacent over hypotenuse, or X in the unit circle. The tangent is sine over cosine, etc. For more information, please see the related link below.

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Tetrahedrons are triangular based pyramids that have 4 faces, 6 edges and 4 vertices which were built by the ancient Egyptians.

If you're talking about the old word for black skinned people then 'negro' derived from Spanish meaning black. And if you just want the word.

English - Spanish

Black - Negro So it's Spanish Hope I helped :)

An acute angled triangle means all the angles are less than 90 degrees because an acute angle is an angle less than 90 degrees.

Rewrite 1/cos x as (cos x)-1 and use chain rule.

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Let the angles be A B C and their opposite sides be a b c and use the cosine rule to find the first two angles and then deduct them from 180 degrees to find the third angle and so therefore it follows that the angles are: 88.05 degrees, 52.01 degrees and 39.94 degrees.

The Period

G(x) = log(2x) + 2, obviously!

based on my stock knowledge, i think hipparchus is the father of trigonometry.....

Hipparchus was recognized as the first mathematician known to have possessed a trigonometric table, which he needed when computing the eccentricity of the orbits of the Moon and Sun. He tabulated values for the chord function, which gives the length of the chord for each angle. He did this for a circle with a circumference of 21600 and a radius (rounded) of 3438 units: this circle has a unit length of 1 arc minute along its perimeter. He tabulated the chords for angles with increments of 7.5°.

Trigonometry can be used to find the heights of buildings when paired with a sextant (a device for measuring angles from the buliding)

The same as it is now : measurement of angles and the lengths of the sides of triangular shapes. More complex shapes ha to be broken down into triangles.

An important contribution by Menelaus of Alexandria was his works on geodesics.

libraries have trig books.

BSW is a Bachelor's in Social Work.

A CAS is a Certificate of Advanced Study. It usually refers to a graduate school degree above the Masters level. It is not to be confused with a CERT degree.

S50W is a direction - approximately SouthWest) in two dimensional space. In a 3D problem, by itelf, S50W has no meaning at all.

A function can map each element in the domain to only one element in the codomain or range. A relation is not so restricted.

A simple non-mathematical illustration:

relation: y = biological parent(x)

function: z = biological mother(x)

Leaving aside complications from surrogacy or other exceptional situations, each person has only one natural mother. Siblings may share the same natuarl mother but they are different elements of the domain.

However, for each person, there are two biological parents. The relationship or mapping is said to be one to many, and is therefore not a function.

sin(theta) is the y-coordinate of the intersection of a line forming an angle with the positive x-axis and the unit circle (i.e., circle of radius one, centered at the origin). The unit circle has its highest y-value at the point (0,1). Drawing the unit circle on a graph makes this obvious.

Assume that there were a higher y-value than one possible. y>1 --> y2>1. Because x2>=0 for all real x, y2>1 --> x2+y2>1, which is impossible for a point on the unit circle (since for all points on the unit circle (x,y), x2+y2=1).

Congruent (APEX) :P