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Cosine

Note: In this series A is in radians.
Note: Valid for 0 ≤ A ≤ π/2
Note: Valid for 0 ≤ A ≤ π/2















The following expression is also known as the half angle formula:

Inverse trigonometric functions are often written as arccos(A) or cos^-1(A)
Note: Valid for 0 ≤ A ≤ π/2

See also: Cosecant, Cotangent, Secant, Series Expansions, Sine, Tangent.

Subjects: Trigonometry