App description

Half angle formula is a formula that uses sine value, cosine value, tangent value and other trigonometric function value of a certain angle (such as ∠ a) to calculate its half angle sine value, cosine value, tangent value and other trigonometric function value.

Half angle formula of trigonometric function

\(sin(a/2)=√((1-cosa)/2) sin(a/2)=-√((1-cosa)/2)\)

\(cos(a/2)=√((1+cosa)/2) cos(a/2)=-√((1+cosa)/2)\)

\(tan(a/2)=√((1-cosa)/((1+cosa)) tan(a/2)=-√((1-cosa)/((1+cosa))\)

\(ctg(a/2)=√((1+cosa)/((1-cosa)) ctg(a/2)=-√((1+cosa)/((1-cosa))\)

Usage example

Angle: 60

Click "sin (U/2)" and output the result

Result: sin (60/2)=0.5