Review_Unit 4_Trig Identities

$$\cot^2x$$  

$$\tan^2x$$  

$$\csc^2x$$  

$$\sin^2x$$  

sinθ

cot²θ

tan²θ

cos²θ

$$\tan\ A\ -\ \tan\ B$$  

$$\frac{\tan\ A\ -\tan\ B}{1+\ \tan A\tan B}$$  

$$\frac{\tan\ A\ +\tan\ B}{1-\ \tan A\tan B}$$  

$$\frac{\sin\ A}{\cos\ B}$$  

-1/5

24/25

-24/25

-25/24

1/4

$$\sin\theta=\frac{1}{\csc\theta}$$  

$$\cos\theta=\frac{1}{\sec\theta}$$  

$$\tan=\frac{1}{\cot\theta}$$  

$$\csc\theta=\frac{1}{\sin\theta}$$  

$$\sec\theta=\frac{1}{\cos\theta}$$  

$$\tan\theta=\frac{1}{\cot\theta}$$

$$\tan\theta=\frac{\sin\theta}{\cos\theta}$$

$$\cot\theta=\frac{1}{\tan\theta}$$

$$\cot\theta=\frac{\cos\theta}{\sin\theta}$$

$$\sin^2\theta\times\cos^2\theta=1$$

$$\sin^2\theta-\cos^2\theta=1$$

$$\sin^2\theta+\cos^2\theta=1$$

$$\frac{\sin^2\theta}{\cos^2\theta}=1$$

$$\cos^2\theta+\sin^2\theta=1$$