Pre-Calc Double Angle Identities

$$-\frac{119}{169}$$  

$$-\frac{120}{169}$$  

$$\frac{119}{120}$$  

$$\frac{120}{119}$$  

cos²θ-sin²θ

2sinθcos

2cos²+1

sin²θ-1

$$-\frac{1}{5}$$

$$\frac{24}{25}$$

$$-\frac{24}{25}$$

$$-\frac{25}{24}$$

$$-\frac{1}{5}$$

$$\frac{24}{25}$$

$$-\frac{24}{25}$$

$$-\frac{25}{24}$$

$$2\sin\left(360\right)\cos\left(360\right)$$

$$2\sin\left(90\right)\cos\left(90\right)$$

$$2\sin\left(180\right)\cos\left(180\right)$$

$$2\cos^2\left(90\right)-1$$

$$\cos^2\alpha-\sin^2\alpha$$  

$$\sin^2\alpha-\cos^2\alpha$$  

$$2\cos^2\alpha$$  

$$1-2\sin^2\alpha$$  

$$2\cos^2\alpha-1$$  

-1/5

24/25

-24/25

-25/24

$$\frac{1}{2}$$

$$\frac{\sqrt[]{2}}{2}$$

$$\frac{\sqrt[]{3}}{2}$$

$$1$$

sin²(25) - cos²(25) 

cos²(50) - sin²(50)

cos²(25) - sin²(25)

sin²(50) - cos²(50)