A Treatise On the Differential And Integral Calculus: And On the Calculus of ...

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A Treatise On the Differential And Integral Calculus: And On the Calculus of ...
Edward Henry Courtenay
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— = — sind, -r^r = — cosd = — or, ad ao* dy dy _ d& _ dx "" dx ~* 1 cfy sin 6 d6 d6 . Digitized by Google CHANGE OF THE INDEPENDENT VARIABLE. 189 dhf dx cPx dy dS dd^ dd 1 d^y dd'i cos a sin 3a ^y dx-^" dx^ " sin 2a <^a rfd3 nee by substitution in the given equation, 1 sin 2j cosd dy sin 3a * cW "^ ^y+y. cos a sin 3a = 0. dB ^ y sin^a" = or This example illustrates the important fact, that a change of the independent variable will sometimes simplify the form of the differ ential equation. dhi d^u 2. Transform -7^ + -r^ = 0, so as to render r the independent yariable, where r^ = aj3 + y\ rr « « « dx r d^x d / r\ Here .2 = ,3 ^y. ..._=._..._ = ^(^j T « x^ dr "^ X «3 "" 0?^ And similiirly - = -, -^ = - _. d^u ^ dr^ dr dr^ dr x^ d^u y* ^|^ •'' ^"" ^[ '^72'"5r2''"'r3* rfr" rf/-3 . - d^u y^ d^u , x^ du And _ = _._ + _._. d^u d^u . • . B7 substitution in the given relation -7-^ + -t-j = ^j ^i^d d^u 1 (^u reduction, — r-z + - • -r- = 0. rfr* r dr 104. Prop. Having given u = F {x, y) when a?

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