Question

Sen150° x cos240° / Sen30°

Answer 1

Sen 150° = Sen 30°

 

$<var>Sen \ 150 = \frac{1}{2}</var>$

 

Cos 240° = Cos 120°

 

$<var>Cos\ 240= -\frac{1}{2}</var>$

 

$<var>Sen\ 30=\frac{1}{2}</var>$

 

Poranto, fica:

 

$<var>\frac{\frac{1}{2}*-\frac{1}{2}}{\frac{1}{2}}</var>$

 

Resultado final:

 

$<var>\boxed{\boxed{-\frac{1}{2}}}</var>$

Answer 2

Sen 150= 1/2

cos 240= -1/2

Sen 30= 1/2

 

1/2 x -1/2 / 1/2

-1/4/1/2 (o 1º x o inverso do 2º)

-1/4 x 2/1

-2/4

-1/2