Trigonometric Ratios
The sine of an angle equals the cosine of its complementary angle. It is therefore true that, if angles A and B are complementary, and .
The tangent of an angle equals the cotangent of its complementary angle. The tangents of complementary angles are reciprocals of each other.
The secant of an angle equals the cosecant of its complementary angle.
The prefix "co-" in the names of some trigonometric ratios refers to the word "complementary".
Read more about this topic: Complementary Angles
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