consider the relationship between the sine and cosine of complementary
ine and cosine of complementary angles.
a. the sine of an angle is equal to the cosine of its compre
complement
to the cosine of its complement, and the cosine of an angle is equal to the sine of its
the relationship to find an equivalent expression for each expression shown.
i. sin 66°
ii. cos 13°
iii. sin 49°
iv. cos 85°