Trigonometry
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http://course-notes.org/Trigonometry
Unit Circles
Subject:
Inverses
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These are the repiprocals of various angle functions:
tan= 1/cot
cos= 1/sec
sin= 1/csc
Thank you.
How to find the center of a circle
Subject:
Distance & Perpendicular Bisectors To find the center of a circle, you must use perpendicular bisectors. The perpendicular bisectors of any two points on a circle always intersect in the middle. A perpendicular bisector is a line intersecting the middle of a chord on a circle with a 90( angle. Somewhere on any one perpendicular bisector is the center, so where the two perpendicular bisectors intersect, that is the center. The two points are Pink The other two points are Orange The perpendicular bisector is Green The Center is Blue Any point on the outside of a circle is always the same distance from the center.
Trigonometry Reference Chart
Subject:
The unit circle is a commonly used tool in trigonometry because it helps the user to remember the special angles and their trigonometric functions. The unit circle is a circle drawn with its center at the origin of a graph(0,0), and with a radius of 1. All angles are measured starting from the x-axis in quadrant one and may go around the unit circle any number of degrees. Points on the outside of the circle that are in line with the terminal (ending) sides of the angles are very useful to know, as they give the trigonometric function of the angle through their coordinants. The format is (cos, sin).
Note that in trigonometry, an angle can be of any size, positive or negative. An angle larger than 360º means that you have gone round the circle more than once.
Identities
Subject:
Pythagorean Identities
sin2 θ + cos2 θ = 1
tan2 θ + 1 = sec2 θ
cot2 θ + 1 = csc2 θ
Odd/Even Identities
sin (–x) = –sin x
cos (–x) = cos x
tan (–x) = –tan x
csc (–x) = –csc x
sec (–x) = sec x
cot (–x) = –cot x
Unit circle
Subject:
In mathematics, a unit circle is a circle with a radius of one. Frequently, especially in trigonometry, "the" unit circle is the circle of radius one centered at the origin (0, 0) in the Cartesian coordinate system in the Euclidean plane.
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Unit circle
Subject:
n mathematics, a unit circle is a circle with a radius of one. Frequently, especially in trigonometry, "the" unit circle is the circle of radius one centered at the origin (0, 0) in the Cartesian coordinate system in the Euclidean plane.
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pythag properties
Subject:
sin^2 + cos^2 =1
1+ tan^2 = sec^2
1+cot^2=csc^2
The quadratic formula
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Tags:
an easy way to remember this quadratic equation to sing it with a pop goes the weezle theme song
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