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The graphs of the functions 
f(x)=sin(x) and 
g(x)=(1)/(2) intersect at 2 points on the interval 
0 < x < pi.
What is the area of the region bound by the graphs of 
f(x) and 
g(x) between those points of intersection ?
Choose 1 answer:
(A) 
(pi)/(3)
(B) 
(pi)/(2)
(C) 
2-(pi)/(2)
(D) 
sqrt3-(pi)/(3)

The graphs of the functions f(x)=sin(x) f(x)=\sin (x) and g(x)=12 g(x)=\frac{1}{2} intersect at 22 points on the interval \( 0

Full solution

Q. The graphs of the functions f(x)=sin(x) f(x)=\sin (x) and g(x)=12 g(x)=\frac{1}{2} intersect at 22 points on the interval 0<x<π 0<x<\pi .\newlineWhat is the area of the region bound by the graphs of f(x) f(x) and g(x) g(x) between those points of intersection ?\newlineChoose 11 answer:\newline(A) π3 \frac{\pi}{3} \newline(B) π2 \frac{\pi}{2} \newline(C) 2π2 2-\frac{\pi}{2} \newline(D) 3π3 \sqrt{3}-\frac{\pi}{3}
  1. Find Intersection Points: First, we need to find the points of intersection between f(x)=sin(x)f(x) = \sin(x) and g(x)=12g(x) = \frac{1}{2} on the interval 0 < x < \pi. To do this, we set f(x)f(x) equal to g(x)g(x) and solve for xx: sin(x)=12\sin(x) = \frac{1}{2}
  2. Calculate Area Between Curves: We know that sin(x)=12\sin(x) = \frac{1}{2} at x=π6x = \frac{\pi}{6} and x=5π6x = \frac{5\pi}{6} within the interval 0 < x < \pi. These are the two points of intersection.
  3. Calculate Integral of sin(x)\sin(x): Next, we calculate the area of the region bound by the two graphs between x=π6x = \frac{\pi}{6} and x=5π6x = \frac{5\pi}{6}. The area under f(x)f(x) from π6\frac{\pi}{6} to 5π6\frac{5\pi}{6} is the integral of sin(x)\sin(x) from π6\frac{\pi}{6} to 5π6\frac{5\pi}{6}. The area under g(x)g(x) from π6\frac{\pi}{6} to 5π6\frac{5\pi}{6} is the integral of x=π6x = \frac{\pi}{6}22 from π6\frac{\pi}{6} to 5π6\frac{5\pi}{6}. The area between the two curves is the difference between these two areas.
  4. Calculate Integral of (1)/(2)(1)/(2): We calculate the integral of sin(x)\sin(x) from π/6\pi/6 to 5π/65\pi/6:π/65π/6sin(x)dx=[cos(x)]π/65π/6\int_{\pi/6}^{5\pi/6} \sin(x) \, dx = [-\cos(x)]_{\pi/6}^{5\pi/6}=cos(5π/6)(cos(π/6))= -\cos(5\pi/6) - (-\cos(\pi/6))=(3/2)(1/2)= -(-\sqrt{3}/2) - (-1/2)=3/2+1/2= \sqrt{3}/2 + 1/2
  5. Subtract Areas: We calculate the integral of (1)/(2)(1)/(2) from π/6\pi/6 to 5π/65\pi/6:π/65π/6(1)/(2)dx=(1)/(2)x\int_{\pi/6}^{5\pi/6} (1)/(2) \, dx = (1)/(2) * x from π/6\pi/6 to 5π/65\pi/6=(1)/(2)(5π/6π/6)= (1)/(2) * (5\pi/6 - \pi/6)=(1)/(2)(4π/6)= (1)/(2) * (4\pi/6)=(1)/(2)(2π/3)= (1)/(2) * (2\pi/3)=π/3= \pi/3
  6. Simplify Expression: Now, we subtract the area under g(x)g(x) from the area under f(x)f(x) to find the area between the two curves:\newlineArea = (3/2+1/2)(π/3)(\sqrt{3}/2 + 1/2) - (\pi/3)\newline= (3/2+1/2)(π/3)(\sqrt{3}/2 + 1/2) - (\pi/3)\newline= (33+3)/(6)(2π)/(6)(3\sqrt{3} + 3)/(6) - (2\pi)/(6)\newline= (33+32π)/(6)(3\sqrt{3} + 3 - 2\pi)/(6)\newline= (332π+3)/(6)(3\sqrt{3} - 2\pi + 3)/(6)
  7. Simplify Expression: Now, we subtract the area under g(x)g(x) from the area under f(x)f(x) to find the area between the two curves:\newlineArea = (3/2+1/2)(π/3)(\sqrt{3}/2 + 1/2) - (\pi/3)\newline= (3/2+1/2)(π/3)(\sqrt{3}/2 + 1/2) - (\pi/3)\newline= (33+3)/(6)(2π)/(6)(3\sqrt{3} + 3)/(6) - (2\pi)/(6)\newline= (33+32π)/(6)(3\sqrt{3} + 3 - 2\pi)/(6)\newline= (332π+3)/(6)(3\sqrt{3} - 2\pi + 3)/(6)We simplify the expression to match one of the given answer choices:\newline(332π+3)/(6)(3\sqrt{3} - 2\pi + 3)/(6)\newline= (3π/3+1/2)(\sqrt{3} - \pi/3 + 1/2)\newlineThis matches answer choice (D) when we multiply the entire expression by 2/22/2 to get a common denominator for f(x)f(x)00 and f(x)f(x)11:\newline= f(x)f(x)22\newline= f(x)f(x)33

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