class 12 maths integrals

$\int {\cfrac{{2 - 3\sin x}}{{{{\cos }^2}x}}dx}$

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📘 Integrals NCERT,ex.7.1,Q.20,Page 299 SA

$\int {\cfrac{{2 - 3\sin x}}{{{{\cos }^2}x}}dx}$

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: Let$I = \int {\cfrac{{2 - 3\sin x}}{{{{\cos }^2}x}}dx} = \int {\left( {\cfrac{2}{{{{\cos }^2}x}} - 3\cfrac{{\sin x}}{{{{\cos }^2}x}}} \right)dx}$

$= \int {\left( {2{{\sec }^2}x - 3\sec x\tan x} \right)dx} = 2\tan x - 3\sec x + C$

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