Trigonometry Smarts! by Rebecca Wingard-Nelson
Author:Rebecca Wingard-Nelson [Wingard-Nelson, Rebecca]
Language: eng
Format: epub
ISBN: 978-1-4645-0364-1
Publisher: Enslow Publishers, Inc.
Published: 2012-03-14T16:00:00+00:00
Look at the relationship between sine and cosine in the triangle below.
The sine of an angle θ has the same value as the cosine of an angle 90 − θ.
The cosine of an angle θ has the same value as the sine of an angle 90 − θ.
Trigonometric functions of an angle have the same value as the cofunctions of its complement.
* * *
In a right triangle, the opposite side to one acute angle is the adjacent side to the other acute angle.
17
Reciprocal Identities
Fractions that are “flipped” are called reciprocals. When reciprocals are multiplied, the product is 1.
Sine and cosecant are reciprocal functions. When a sine ratio is multiplied by the cosecant ratio, the result is 1.
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