From the double-angle identity,

we can rewritte our given equation as:

By factoring 2cosx on the left hand side, we have

This equation has 2 solutions when

From equation (A), we obtain

and from equation (B), we have

On the other hand, we can find one more solution from the original equation by substituting x=0, that is,

then, x=0 is another solution. In summary, we have obtained the following solutions:

However, the intersection of the last set is empty. So the unique solution is x=0 as we can corroborate on the following picture:
Therefore, the solution set is: {0}
Answer: THE ANSWER IS C
Step-by-step explanation:
THE ANSWER IS C I TOOK THE TEST
Answer:
h(t) = 144·t - 16·t^2 = 16·t·(9 - t) = 0
9 - t = 0 --> t = 9
The ball will hit the ground after 9 seconds.
Answer:Numerical digits are the number text characters used to show numerals. For example, the numeral "56" has two digits: 5 and 6
Step-by-step explanation:
The last one is incorrect. The correct answer is division. They divided 9 on both sides.