Concept Check In later chapters we will study trigonometric functions of angles other than quadrantal angles, such as and so on. To prepare for some important concepts, provide conjectures in Exercises 103–106. Be sure that your calculator is in degree mode.
The angles 15° and 75° are complementary. With your calculator determine sin 15° and cos 75°. Make a conjecture about the sines and cosines of complementary angles, and test your hypothesis with other pairs of complementary angles. (Note: This relationship will be discussed in detail in Section 2.1.)
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