Which of the following sets represents a function?
1 answer:
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The solutions appear to be {π/2, 2π/3, 4π/3}.
_____
Replacing sin(2x) with 2sin(x)cos(x), you have
2sin(x)cos(x) +sin(x) -2cos(x) -1 = 0
sin(x)(2cos(x) +1) -(2cos(x) +1) = 0 . . . . factor by grouping
(sin(x) -1)(2cos(x) +1) = 0
This has solutions
sin(x) = 1
x = π/2
and
2cos(x) = -1
cos(x) = -1/2
x = {2π/3, 4π/3}
_____
Replacing sin(2x) with 2sin(x)cos(x), you have
2sin(x)cos(x) +sin(x) -2cos(x) -1 = 0
sin(x)(2cos(x) +1) -(2cos(x) +1) = 0 . . . . factor by grouping
(sin(x) -1)(2cos(x) +1) = 0
This has solutions
sin(x) = 1
x = π/2
and
2cos(x) = -1
cos(x) = -1/2
x = {2π/3, 4π/3}
<u><em>Answer:</em></u>
Area of shaded region = 220.16 ft²
<u><em>Explanation:</em></u>
The diagram associated with this question is shown in the attached image
Unit in diagram is ft, so I'll use this unit in the answer
We are given that a circle with radius 16 ft is inscribed in a square
We know that the radius of an inscribed circle in a square is equivalent to half the length of the side of the square
<u>This means that:</u>
side length of the square = 2 × radius = 2 × 16 = 32 ft
<u>From the diagram, we can note that:</u>
area of shaded region = area of square - area of circle .............> equation I
<u>1- getting area of square:</u>
Area of a square is the square of its side length
<u>This means that:</u>
Area of square = (32)² = 1024 ft²
<u>2- getting the area of the circle:</u>
Area of circle = πr² = 3.14 × (16)² = 803.84 ft²
<u>3- getting area of shaded region:</u>
<u>Use equation I</u>
area of shaded region = area of square - area of circle
area of shaded region = 1024 - 803.84 = 220.16 ft²
Hope this helps :)
