\(\rm x {{dy}\over {dx}}=y+x\ tan {y\over x}\) का हल क्या है?

  1. \(\rm y = c \sin{y\over x}\)
  2. \(\rm x = c \sin{x\over y}\)
  3. \(\rm y = c \sin{x\over y}\)
  4. \(\rm x = c \sin{y\over x}\)

Answer (Detailed Solution Below)

Option 4 : \(\rm x = c \sin{y\over x}\)
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संकल्पना:

कुछ उपयोगी सूत्र निम्न हैं:

\(\rm \int{{dx}\over {x}}=log x+c\)

\(\rm \int{cot\ x\ dx}=log(sin\ x)+c\)

गणना:

\(\rm x {{dy}\over {dx}}=y+x\ tan {y\over x}\)

y=vx रखने पर और \(\rm v+x {{dv}\over{dx}} = {{dy}\over {dx}}\) 

\(\rm x [v+x{{dv}\over {dx}}]=vx+x\ tan {v}\)

\(\rm x [v+x{{dv}\over {dx}}]=x(v+ tan {v})\)

\(\rm \int{{dx}\over {x}}=\int{{dv}\over tan {v}}\)

\(\rm \int{{dx}\over {x}}=\int{cotv\ dv}\)

log x = log (sinv) + log c

x = c sinv

v का मान रखने पर हमें निम्न प्राप्त होता है, 

\(\rm x = c\sin{y\over x}\)             

[जहाँ c = समाकलन का स्थिरांक]

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