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Prove the following: tan-1(12)+tan-1(13)=π4 - Mathematics and Statistics

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प्रश्न

Prove the following:

`tan^-1(1/2) + tan^-1(1/3) = pi/(4)`

योग
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उत्तर

L.H.S. = `tan^-1(1/2) + tan^-1(1/3)`

= `tan^-1 [(1/2 + 1/3)/(1 - 1/2 * 1/3)]`    ...since `1/2 > 0, 1/3 > 0` and `(1/2)(1/3) < 1`

= `tan ^-1 ((5/6)/(1 - 1/6))`

= `tan^-1((5/6)/(5/6))`

= tan-1(1)

= `tan^-1(tan  pi/4)`

= `pi/(4)`

= R.H.S.

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  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 3: Trigonometric Functions - Exercise 3.3 [पृष्ठ १०३]

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बालभारती Mathematics and Statistics 1 (Arts and Science) [English] Standard 12 Maharashtra State Board
अध्याय 3 Trigonometric Functions
Exercise 3.3 | Q 3.5 | पृष्ठ १०३
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