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The 25 pages that link to Trigonometric functions, each with the reason it gives.

• Exponential functionCompared with: Its repeating values contrast with the unbounded growth or decay of real exponentials.

• RadianRelated: Their standard analytic definitions and calculus identities use radian-valued angles.

• Right triangleNarrower topic: Sine, cosine, and tangent encode ratios of this triangle’s sides.

• SineNarrower topic: Sine belongs to this family alongside cosine and tangent.

• Unit circleNarrower topic: The unit circle provides a geometric definition of their values for all real angles.

• Degree (angle)Related: Their inputs can be expressed in degrees, with conversion conventions affecting calculations.

• Polar coordinate systemRelated: Sine and cosine resolve a polar radius into Cartesian components.

• Polynomial functionCompared with: Periodic behavior cannot be captured globally by a nonconstant polynomial.

• Small-angle approximationNarrower topic: Tangent belongs to this family, whose angle conventions determine the approximation.

• Inverse trigonometric functionsCompared with: They map angles to ratios, while their inverses map selected ratios back to angles.

• AntiderivativeRelated: Their derivative relationships yield familiar antiderivatives such as those of sine and cosine.

• Euler's identityNarrower topic: Euler's formula connects these functions directly to complex exponentials.

• Hyperbolic functionsCompared with: Their familiar identities and names provide the analogy behind the hyperbolic functions.

• Slide ruleNarrower topic: Sine, cosine, and tangent scales let slide rules evaluate common angle calculations.

• Abraham de MoivreRelated: His formula links repeated multiplication of complex numbers to angle multiplication.

• Polar formNarrower topic: Sine and cosine express the angle's direction as real and imaginary components.

• Spherical law of cosinesNarrower topic: Sine and cosine encode the sides and angles in the spherical formula.

• Directed angleRelated: Sine and cosine use directed angles and repeat after full rotations.

• Bretschneider's formulaNarrower topic: The angular correction is expressed through a cosine of opposite-angle sum.

• Madhava of SangamagramaNarrower topic: His best-known series express sine, cosine, and arctangent.

• Pythagorean trigonometric identityNarrower topic: The identity is a relation among particular trigonometric functions.

• Elementary functionBroader topic: Trigonometric functions are explicitly included among the permitted building blocks.

• Even and odd functionsBroader topic: Sine is odd, cosine is even, and their parity follows from angle reflection.

• Differentiation rulesRelated: Their derivative formulas are standard inputs to the chain and product rules.

• Mollweide's formulaNarrower topic: The identities express triangle measurements through the tangent function.