Cofunction Identities on the Unit Circle
See cofunction identities on the unit circle: complementary angle positions, x/y role swaps, and step-by-step examples that connect geometry to exact trig values.
Cofunction Learning Blog
Step-by-step articles on cofunction definitions, formulas, calculations, examples, and trigonometry applications.
Cofunction vs Reciprocal Functions
Compare cofunction identities (90° - x partner swap) with reciprocal identities (1/x). Avoid common mix-ups with side-by-side rules and worked examples.
Cofunctions in Trigonometry
Explore cofunctions in trigonometry via right triangles, the unit circle, graph symmetry, and identity-based simplification for stronger exam performance.
Complementary Angles Calculator
Understand complementary angles that sum to 90°, how they drive cofunction identities, and how to apply 90° - x in geometry and trigonometry problems.
Cofunction Identities
Full list of cofunction identities for sin/cos, tan/cot, and sec/csc with complementary angle formulas, memory tips, proofs, and expression simplification strategies.
Cofunction Examples
Worked cofunction examples for sin, cos, tan, cot, sec, and csc in degrees and radians. Practice complementary angle swaps and check each result quickly.
Cofunction Calculator
Guide to using the cofunction calculator: pick sin, cos, tan, cot, sec, or csc, enter an angle in degrees, and read the identity plus numeric check instantly.
How to Calculate Cofunctions
Learn how to calculate cofunctions: find the complementary angle, swap function pairs, simplify step by step, and verify answers with worked degree and radian examples.
Cofunction Formula
Complete cofunction formulas including sin(90° - θ) = cos(θ), with degree and radian forms, identity pairs for all six trig functions, and simplification tips.
What Is a Cofunction?
Learn what a cofunction is, how complementary angles (90° - x) link sin/cos, tan/cot, and sec/csc, and how to recognize cofunction pairs in homework and exams.