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  • Need solution for RD Sharma maths class 12 chapter Indefinite Integrals exercise 18.8 question 19

Need solution for RD Sharma maths class 12 chapter Indefinite Integrals exercise 18.8 question 19

Answers (1)

Answer:

        \frac{1}{b-a}In\left | a\: cos^{2}\: x+b\: sin^{2}\: x \right |+C

Hint:

        \int \! \frac{dt}{t}=log\left | t \right |+C

Given:

        \int \! \frac{sin\: 2x}{a\: cos^{2}\: x+b\: sin^{2}x}dx            ........(1)

Explanation:

Let

        a\: cos^{2}\: x+b\: sin^{2}x=t

        (2a\, cos\, x(-sin\, x)+b(2\, sin\, x)(cos\, x))dx=dt

        (b-a)[2\, cos\, x\, sin\, x]dx=dt

        (b-a)sin\, 2x\, dx=dt

        sin\, 2x\, dx=\frac{dt}{b-a}

Put in (1)

        \frac{1}{b-a}\int \! \frac{dt}{t}

        =\frac{1}{b-a}In\left | t \right |+C

        =\frac{1}{b-a}In\left | a\: cos^{2}\: x+b\: sin^{2} \right |+C

 

Posted by

Gurleen Kaur

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