Half Angle Identities

Reference > Algebra: Trigonometric Identities

Description

\({sin}^{2}x=\frac{1-\cos{2x}}{2}\)

\({cos}^{2}x=\frac{1+\cos{2x}}{2}\)

\(\tan{\frac{x}{2}}=\frac{\sin{x}}{1+\cos{x}}=\frac{1-\cos{x}}{\sin{x}}\)