मराठी

∫ 1 2 − 3 Cos 2 X Dx - Mathematics

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प्रश्न

\[\int\frac{1}{2 - 3 \cos 2x} \text{ dx }\]

बेरीज
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उत्तर

`int 1/[ 2 - 3cos2x] dx`

As `cos 2x = 2cos^x - 1`

So `int 1/[ 2 - 3cos2x] dx = int 1/[2 - 3( 2cos^x - 1) ]`

And multiply and divide by sec2x
Then we have `int  sec^2x/[5sec^2x - 6]` dx

= `int   (sec^2x)/[5( 1 + tan^2x) - 6]`

=  `int (sec^2x dx)/( 5tan^2x - 1)`

Let tan x = t, then sec2x dx = dt

Hence `int [sec^2x]/[ 5tan^2x - 1]` 

= `int dt/[5t^2 - 1]`

= `1/5 int  dt/[t^2 - (1/sqrt5)^2]`

= `1/5 log |[ t - 1/sqrt5 ]/[ t + 1/sqrt5 ]|`

= `1/5 log |[ tan x - 1/sqrt5]/[ tan x + 1/sqrt5 ]| + c`

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पाठ 19: Indefinite Integrals - Revision Excercise [पृष्ठ २०४]

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आरडी शर्मा Mathematics [English] Class 12
पाठ 19 Indefinite Integrals
Revision Excercise | Q 62 | पृष्ठ २०४

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