Question

find the sign of cos 330
​

Answer 1

Answer:

The sign of the cos 330° is positive.

Step-by-step explanation:

For solving this we first have to find out in which quadrant is the given angle present. For this, we have cos 330°.

Now we break 330° = 3×90 ° + 60 °

Hence the given angle that we have lies in the fourth quadrant,

as 270° < 330° < 360°

Now we know that in the 4th quadrant the sign of cosine functions is taken to be positive hence we have the resultant sign to be positive.

Now cos ( 3×90 ° + 60 ° ) = sin 60 ° = $\frac{\sqrt{3} }{2}$

Hence cos 330° has a positive sign.