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Evaluate: ∫0πcos2x dx

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प्रश्न

Evaluate: `int_0^pi cos^2 x  "d"x`

योग
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उत्तर

`int_0^pi cos^2 x  "d"x = int_0^pi((1 + cos 2x)/2)  "d"x`

= `1/2[int_0^pi "d"x + int_0^pi cos 2x  "d"x]`

= `1/2[[x]_0^pi + [(sin 2x)/2]_0^pi]`

= `1/2[(pi - 0) + 1/2(sin 2pi - sin 0)]`

= `1/2[pi + 1/2(0 - 0)]`

= `pi/2`

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Methods of Evaluation and Properties of Definite Integral
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 2.4: Definite Integration - Short Answers I

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