The angles 15 and 75 are complementary. With your
Chapter 1, Problem 103(choose chapter or problem)
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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