Question

calcule :

 cotg 225 º ,sec 25 º ,cosec 30 º :

Answer 1

Cotg de 225° = $<var>\frac{cosx}{senx}</var>$

 

 

Cotg 225 = $<var>\frac{cos225}{sen225}</var>$

 

Cotg 225 = $<var>\frac{-\sqrt{2/2}}{\sqrt{2/2}}</var>$

 

Cotg 225 = -1

 

 

Sec 45 = Inverso do cosseno

 

Sec 45 = 1/V2/2

Sec 45 = V2/2

 

Cosec = inverso do seno

 

Cosec 30 = 1/1/2

 

Cosec 30 = 2