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Ch. 5 - Integration
Briggs - Calculus: Early Transcendentals 3rd Edition
Briggs3rd EditionCalculus: Early TranscendentalsISBN: 9780136847243Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBriggs 3rd EditionCh. 5 - IntegrationProblema 5.3.71
Capitolo 5, Problema 5.3.71

Areas of regions Find the area of the region bounded by the graph of ƒ and the 𝓍-axis on the given interval.


ƒ(𝓍) = sin 𝓍 on [―π/4, 3π/4]

Guida verificata passo dopo passo
1
Step 1: Understand the problem. We are tasked with finding the area of the region bounded by the graph of ƒ(𝓍) = sin(𝓍) and the 𝓍-axis over the interval [―π/4, 3π/4]. This involves integrating the function ƒ(𝓍) = sin(𝓍) over the given interval.
Step 2: Set up the definite integral. The area can be calculated using the formula: ∫a−bsindx
Step 3: Evaluate the integral of sin(𝓍). Recall that the integral of sin(𝓍) is −cos(𝓍). Substitute this into the integral: ∫a−bsindx
Step 4: Apply the Fundamental Theorem of Calculus. Evaluate −cos(𝓍) at the bounds of the interval [―π/4, 3π/4]. This means substituting the upper bound (3π/4) and the lower bound (―π/4) into −cos(𝓍) and subtracting the results.
Step 5: Simplify the expression. Compute the values of −cos(3π/4) and −cos(―π/4), then subtract them to find the area. Remember that the area is always positive, so take the absolute value if necessary.

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Definite Integral

The definite integral of a function over a specified interval represents the net area between the graph of the function and the x-axis. It is calculated using the Fundamental Theorem of Calculus, which connects differentiation and integration. In this context, the area can be found by integrating the function ƒ(𝓍) = sin 𝓍 from the lower limit of -π/4 to the upper limit of 3π/4.
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Definition of the Definite Integral

Area Under the Curve

The area under the curve of a function can be positive or negative depending on whether the function is above or below the x-axis. When calculating the total area, it is important to consider the absolute value of the areas where the function is negative, as these contribute to the overall area of the region bounded by the graph and the x-axis.
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Estimating the Area Under a Curve with Right Endpoints & Midpoint

Properties of the Sine Function

The sine function, ƒ(𝓍) = sin 𝓍, is periodic and oscillates between -1 and 1. Understanding its behavior over the interval [-π/4, 3π/4] is crucial for determining the area, as it crosses the x-axis at specific points. This knowledge helps in identifying the segments of the interval where the function is positive or negative, which is essential for accurate area calculation.
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Properties of Functions
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