Q. The graphs of the functions f(x)=sin(x) and g(x)=21 intersect at 2 points on the interval 0<x<π.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) 3π(B) 2π(C) 2−2π(D) 3−3π
Find Intersection Points: First, we need to find the points of intersection between f(x)=sin(x) and g(x)=21 on the interval 0 < x < \pi. To do this, we set f(x) equal to g(x) and solve for x: sin(x)=21
Calculate Area Between Curves: We know that sin(x)=21 at x=6π and x=65π within the interval 0 < x < \pi. These are the two points of intersection.
Calculate Integral of sin(x): Next, we calculate the area of the region bound by the two graphs between x=6π and x=65π. The area under f(x) from 6π to 65π is the integral of sin(x) from 6π to 65π. The area under g(x) from 6π to 65π is the integral of x=6π2 from 6π to 65π. The area between the two curves is the difference between these two areas.
Calculate Integral of (1)/(2): We calculate the integral of sin(x) from π/6 to 5π/6:∫π/65π/6sin(x)dx=[−cos(x)]π/65π/6=−cos(5π/6)−(−cos(π/6))=−(−3/2)−(−1/2)=3/2+1/2
Subtract Areas: We calculate the integral of (1)/(2) from π/6 to 5π/6:∫π/65π/6(1)/(2)dx=(1)/(2)∗x from π/6 to 5π/6=(1)/(2)∗(5π/6−π/6)=(1)/(2)∗(4π/6)=(1)/(2)∗(2π/3)=π/3
Simplify Expression: Now, we subtract the area under g(x) from the area under f(x) to find the area between the two curves:Area = (3/2+1/2)−(π/3)= (3/2+1/2)−(π/3)= (33+3)/(6)−(2π)/(6)= (33+3−2π)/(6)= (33−2π+3)/(6)
Simplify Expression: Now, we subtract the area under g(x) from the area under f(x) to find the area between the two curves:Area = (3/2+1/2)−(π/3)= (3/2+1/2)−(π/3)= (33+3)/(6)−(2π)/(6)= (33+3−2π)/(6)= (33−2π+3)/(6)We simplify the expression to match one of the given answer choices:(33−2π+3)/(6)= (3−π/3+1/2)This matches answer choice (D) when we multiply the entire expression by 2/2 to get a common denominator for f(x)0 and f(x)1:= f(x)2= f(x)3
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