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Cofunctioncot(81)

Maya Lin-Takahashi • Oct 10, 2026 • 3 min read

Cofunctioncot(81)

An insightful review of Cofunctioncot(81)—uncover the main takeaways.

Trig Function	Cofunction
sin	cos
cos	sin
tan	cot
csc	sec
sec	csc
cot	tan

Cofunction Definition:

Trig measure for:
Angle complement: 90 - θ

Setup cofunction for cot(θ)

cot(θ) = tan(90° - θ)

Plug in θ = 81

cot(81) = tan(90° - 81)

cot(81) = tan(9)

Final Answer

cot(81) = tan(9)

You have 1 free calculations remaining

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What is the Answer?

cot(81) = tan(9)

How does the Cofunction Calculator work?

Free Cofunction Calculator - Calculates the cofunction of the 6 trig functions: * sin
* cos
* tan
* csc
* sec
* cot

This calculator has 1 input.

What 7 formulas are used for the Cofunction Calculator?

sin(θ) = cos(90 - θ)
cos(θ) = sin(90 - θ)
tan(θ) = cot(90 - θ)
csc(θ) = sec(90 - θ)
sec(θ) = csc(90 - θ)
cot(θ) = tan(90 - θ)

For more math formulas, check out our Formula Dossier

What 11 concepts are covered in the Cofunction Calculator?

angle: the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle.
cofunction: trigonometric identities that show the relationship between trigonometric ratios pairwise (sine and cosine, tangent and cotangent, secant and cosecant).
cofunction calculator
cos: cos(θ) is the ratio of the adjacent side of angle θ to the hypotenuse
cot: The length of the adjacent side divided by the length of the side opposite the angle. Also equals 1/tan(θ)
csc: the length of the hypotenuse divided by the length of the adjacent side. Also equals 1/sin(θ)
gradian: defined as one hundredth of the right angle. This is equal to π/200 or 9/10°
radian: a unit of plane angular measurement that is equal to the angle at the center of a circle subtended by an arc whose length equals the radius or approximately 180°/π ~ 57.3 degrees.
sec: the length of the hypotenuse divided by the length of the adjacent side. Also equals 1/cos(θ)
sin: sin(θ) is the ratio of the opposite side of angle θ to the hypotenuse
tan: the ratio of the opposite side to the adjacent side of a particular angle of the right triangle.

Example calculations for the Cofunction Calculator

Author

Maya Lin-Takahashi

Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.