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Overview of Application of Definite Integration

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key Points: Area Under the Curve

Case Formula
Area under y = f(x) \[\int_a^bf(x)dx\]
Area between curves \[\int_a^b[f(x)-g(x)]dx\]
Area w.r.t. y-axis
x = g(y)
\[\int_c^dg(y)dy\]
Even function \[2\int_0^af(x)dx\]
Odd function 0

If the area A lies below the X-axis, then A is negative, and in this case, we take | A |.

Maharashtra State Board: Class 12

Key Points: Symmetry of Curve

Type of Symmetry Condition Replacement Rule Result
About the X–axis (x, y) ∈ C ⇔ (x, -y) ∈ C Replace y by -y Curve is symmetric about the X–axis
About the Y–axis (x, y) ∈ C ⇔ (-x, y) ∈ C Replace x by -x Curve is symmetric about the Y–axis
About Origin Equation unchanged when both signs change Replace x → -x, y → -y The curve is symmetric about Origin
Maharashtra State Board: Class 12

Key Points: Standard Curves

Parabola:

  • y2 = 4ax → opens right

  • y2 = −4ax → opens left

  • x2 = 4ay → opens upward

  • x2 = −4ay → opens downward

Ellipse:

  • \[\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\quad(a>b)\]

  • \[\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\quad(a<b)\]

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