Explanation:
The identity we'll use is cos(-x) = cos(x) for any value of x.
So cos(-150) = cos(150).
Then locate the angle 150 on the unit circle. The terminal point is
The x coordinate of this terminal point is the value of cos(150).
✩ Answer:
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✩ Step-by-step explanation:
✧･ﾟ: *✧･ﾟ:*✧･ﾟ: *✧･ﾟ:*✧･ﾟ: *✧･ﾟ:*
✺ Divide both sides by −3. Since −3 is negative, the inequality direction is changed:
✺ Divide −9 by −3 to get 3. Since they are both negatives it turns into a positive:
✺ Swap sides so that all variable terms are on the left hand side. This changes the sign direction once more:
✺ Add 2 to both sides:
✺ Add 3 and 2 to get 5:
✺ Divide both sides by 5. Since 5 is positive, the inequality direction remains the same:
✺ Divide 5 by 5 to get 1:
✺ So your answer is B, .
(Number line is below.)
