To find the area of the region enclosed by the curves y=sin(x) and y=cos(x) on the interval [0,2π], follow these steps:
Step 1: Determine the Points of Intersection
Set sin(x)=cos(x) to find the points where the curves intersect.
sin(x)=cos(x)
Divide both sides by cos(x) (assuming cos(x)=0):
tan(x)=1
The solution for x within the interval [0,2π] is:
x=4π
Step 2: Set Up the Integral
The area A between two curves y=f(x) and y=g(x) from a to b is given by:
A=∫ab∣f(x)−g(x)∣dx
For the interval [0,4π]:
A1=∫04π(cos(x)−sin(x))dx
For the interval [4π,2π]:
A2=∫4π2π(sin(x)−cos(x))dx
Step 3: Compute the Integrals
A1=∫04π(cos(x)−sin(x))dx=[sin(x)+cos(x)]04π
=(sin(4π)+cos(4π))−(sin(0)+cos(0))
=(22+22)−(0+1)=2−1
A2=∫4π2π(sin(x)−cos(x))dx=[−cos(x)−sin(x)]4π2π
[
= \left[-\cos\left(\frac{\pi}{2}\right) - \sin\left(\frac{\pi}{2}\right)\right] - \left[-\cos\left(\frac{\pi}{4}\right) - \sin\left(\frac{\pi}{4}\right)\right]
]
[
= \left[-0 - 1\right] - \left[-\frac{\sqrt{2}}{2} - \frac{\sqrt{2}}{2}\right] = -1 + \sqrt{2}
]
Step 4: Add the Two Areas Together
A=A1+A2=(2−1)+(2−1)=22−2
Thus, the area of the region enclosed by the curves y=sin(x) and y=cos(x) on the interval [0,2π] is:
22−2
Would you like further details or have any questions?
Here are 5 related questions to explore:
- How would the area change if the interval was [0,π]?
- Can you find the area between y=sin(x) and y=cos(x) on [−2π,2π]?
- What happens to the area if we consider the interval [0,π/4] only?
- How do we calculate the area between y=sin(2x) and y=cos(2x) on [0,2π]?
- What if the curves were y=sin(x) and y=sin(2x) on [0,π]?
Tip: When comparing areas under curves, always identify the points of intersection to correctly set up your integral limits.