Identidades Trigonométricas 3

• 2 * Sen(x) * Cos(x)
• Sen(2) * Sen(x)
• Sen(x) + Cos(x)
• Sen(x) / Cos(x)

• cos(2x) = cos^2(x) - sin^2(x)

• cos(2x) = 1 - 2sin^2(x)

• cos(2x) = 2cos^2(x) - 1

• cos(2x) = 2sin^2(x) + 1

• tan(2x) = rac{ tan(x)}{1 + an^2(x)}

• tan(2x) = rac{ tan^2(x)}{2 tan(x)}

• tan(2x) = rac{1 - tan(x)}{1 + tan(x)}

• \tan(2x) = \frac{2\tan(x)}{1 - \tan^2(x)}

sin(x/2)

• sin(x/2) = √(1 - cos(x))
• sin(x/2) = (1 - cos(x))/2
• sin(x/2) = √((1 + cos(x))/2)
• sin(x/2) = ±√((1 - cos(x))/2)

cos(x/2)

• cos(x/2) = 1 - cos(x)
• cos(x/2) = √((1 - cos(x))/2)
• cos(x/2) = (1 - cos(x))/2
• cos(x/2) = ±√((1 + cos(x))/2)

tan(x/2)=

• tan(x/2) = ±√((1 - cos(x))/2)

• tan(x/2) = ±√((1 + cos(x))/2)

• tan(x/2) = ±√((1 - cos(x))/((1 + cos(x)))

• tan(x/2) = ±√((1 + cos(x))/((1 - cos(x)))