evaluate cos930degree
Answers
Step-by-step explanation:
Remove full rotations of
360° until the angle is between
0° and 360°
cos (210)
Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cosine is negative in the third quadrant.
-cos(30)
The exact value of
cos(30) is
√3/2 -√3/2
The result can be shown in multiple forms.
Exact Form:
-√3/2
Decimal Form:
0.86602540.
Answer:
Step-by-step explanation:
Remove full rotations of
360° until the angle is between
0° and 360°
cos (210)
Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cosine is negative in the third quadrant.
-cos(30)
The exact value of
cos(30) is
√3/2 -√3/2
The result can be shown in multiple forms.
Exact Form:
-√3/2
Decimal Form:
0.86602540.