untitled

$$\sin x+\cos x=1$$

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

$$\sin^2x+\cos^2y=1$$

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

$$\frac{\cos x}{\sin x}$$

$$1+\frac{1}{\cos^2x}$$

$$\frac{\sin x}{\cos x}$$

$$1+\cos x$$

cosacosb+sinasinb

cosasinb-cosbsina

cosasina+cosbsinb

cosacosb-sinasinb

cosa

sina

-sina

-cosa

$$\frac{tga+tgb}{1-tgatgb}$$  

$$\frac{tga-tgb}{1+tgatgb}$$  

$$\frac{1-tgatgb}{tga+gb}$$  

$$\frac{1+tgatgb}{tga-tgb}$$  

sin(-a)

cos(-a)

tg(-a)

ctg(-a)

sina

cosa

tga

ctga

sinx

cosx

tgx

ctgx

1/2

1

√3/2

√3/3

$$\sin\alpha$$   

$$\cos\alpha$$  

$$tg\alpha$$  

$$\operatorname{ctg}\alpha$$