Answer:
The solution for the given expression x ix 6.
Step-by-step explanation:
Solution:
Step 1: Adding (-4x) on both sides
Step 2: Adding (5) on both sides:
The solution for the given expression x ix 6.
What is the value of arccos(−1/2)in radians? a) 2pi/3 b)pi/3 c)pi/6 d)5pi/6
1 answer:
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Answer:
40°
Step-by-step explanation:
The reference angle is the positive acute angle created by the terminal arm and the x-axis.
The highlighted red in the picture below shows what we're looking for.
The arm rotated 220° (but 'backwards' so the value given is negative).
|-220°| - 2(90°) <= Subtract two right angles for two quadrants
= 220° - 2(90°)
= 220° - 180°
= 40°
Therefore, the reference angle is 40°.
If you got 50°, you probably calculated the angle with the terminal arm and the y-axis. Remember to always use the nearest side of the x-axis!
