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# Trigonom

TermDefinition
radians A unit of angle, equal to an angle at the center of a circle whose arc is equal in length to the radius.
coterminal angle Two angles are coterminal if they are drawn in the standard position and both have their terminal sides in the same location.
quadrantal angle An angle in standard position with terminal side lying on x-axis or y-axis
unit circle a circle with a radius of one.
reference angle the angle of less than 360 degrees that corresponds to an angle of over 360 degrees
sine The trigonometric function that is equal to the ratio of the side opposite a given angle (in a right triangle) to the hypotenuse.
cosine The trigonometric function that is equal to the ratio of the side adjacent to an acute angle (in a right-angled triangle) to the hypotenuse.
tangent A straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.
cosecant The ratio of the hypotenuse (in a right-angled triangle) to the side opposite an acute angle; the reciprocal of sine.
secant The ratio of the hypotenuse to the shorter side adjacent to an acute angle (in a right-angled triangle); the reciprocal of a cosine.
cotangent The length of the adjacent side divided by the length of the opposite side.
inverse opposite
arcsin Inverse of sine function
arccos the inverse function of the cosine; the angle that has a cosine equal to a given number.
arctan the inverse function of the tangent; the angle that has a tangent equal to a given number.
law of sines a law stating that the ratio of a side of a plane triangle to the sine of the opposite angle is the same for all three sides.
law of cosines a law stating that the square of a side of a plane triangle is equal to the sum of the squares of the other two sides minus twice the product of the other sides.
Created by: CourtneyDB