Math
Half-Angle Calculator
sin(θ/2) and cos(θ/2) from θ in degrees (principal square roots with sign of the half-angle in (−90°, 90°)).
Free to use — no sign-up or login.
sin(θ/2)
cos(θ/2)
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This free Half-Angle Calculator covers sin(θ/2) and cos(θ/2) from θ in degrees (principal square roots with sign of the half-angle in (−90°, 90°)).
Half-angle formulas take square roots of (1±cos θ)/2. Related math tools sit beside How it works, with no account required.
Using the Half-Angle Calculator
sin(θ/2) and cos(θ/2) from θ in degrees (principal square roots with sign of the half-angle in (−90°, 90°)). Typical inputs are θ (°). How it works beside the form states the identity the Half-Angle Calculator applies.
FAQ
How do I use the Half-Angle Calculator?
Open the Half-Angle Calculator, fill θ (°), and read the result. Half-angle formulas take square roots of (1±cos θ)/2.
What formula does the Half-Angle Calculator use?
The Half-Angle Calculator uses the identity in How it works. In words: Half-angle formulas take square roots of (1±cos θ)/2.