Calculate sin(θ/2), cos(θ/2), or tan(θ/2) using half angle formulas.
Calculate sin(θ/2), cos(θ/2), or tan(θ/2) using half angle formulas.
The base angle θ.
Half angle formulas express trig functions of θ/2 in terms of functions of θ: sin(θ/2)=±√((1−cosθ)/2), cos(θ/2)=±√((1+cosθ)/2), tan(θ/2)=sinθ/(1+cosθ).
How this calculator works
Half angle formulas express trig functions of θ/2 in terms of functions of θ: sin(θ/2)=±√((1−cosθ)/2), cos(θ/2)=±√((1+cosθ)/2), tan(θ/2)=sinθ/(1+cosθ).
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