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%%
%% This is file `easy.tex',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% probsoln.dtx (with options: `easy.tex,package')
%% Copyright (C) 2006 Nicola Talbot, all rights reserved.
%% If you modify this file, you must change its name first.
%% You are NOT ALLOWED to distribute this file alone. You are NOT
%% ALLOWED to take money for the distribution or use of either this
%% file or a changed version, except for a nominal charge for copying
%% etc.
%% \CharacterTable
%% {Upper-case \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%% Lower-case \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%% Digits \0\1\2\3\4\5\6\7\8\9
%% Exclamation \! Double quote \" Hash (number) \#
%% Dollar \$ Percent \% Ampersand \&
%% Acute accent \' Left paren \( Right paren \)
%% Asterisk \* Plus \+ Comma \,
%% Minus \- Point \. Solidus \/
%% Colon \: Semicolon \; Less than \<
%% Equals \= Greater than \> Question mark \?
%% Commercial at \@ Left bracket \[ Backslash \\
%% Right bracket \] Circumflex \^ Underscore \_
%% Grave accent \` Left brace \{ Vertical bar \|
%% Right brace \} Tilde \~}
\newproblem{diffeasy:gpowh}{%
\(f(x) = g(x)^{h(x)}.\)}{%
\begin{eqnarray*}
f(x) & = & e^{\ln g(x)^{h(x)}}\\
& = & e^{h(x)\ln g(x)}\\
f'(x) & = & e^{h(x)\ln g(x)}(h'(x)\ln g(x) + h(x)\frac{g'(x)}{g(x)})\\
& = & g(x)^{h(x)}(h'(x)\ln g(x) + \frac{h(x)g'(x)}{g(x)})
\end{eqnarray*}}
\newproblem{diffeasy:arcsin}{%
\(y = \arcsin(x)\)}{%
\[\sin(y) = x\]
diff. w.r.t. $x$:
\begin{eqnarray*}
\cos y \frac{dy}{dx} & = & 1\\
\frac{dy}{dx} & = & \frac{1}{\cos y}\\
& = & \frac{1}{\sqrt{1 - \sin^2y}}\\
& = & \frac{1}{\sqrt{1-x^2}}.
\end{eqnarray*}}
\newproblem{diffeasy:arccos}{%
$y = \arccos x$.}{%
\(\cos y = x\)
diff. w.r.t. $x$:
\begin{eqnarray*}
-\sin y \frac{dy}{dx} & = & 1\\
\frac{dy}{dx} & = & \frac{-1}{\sin y}\\
& = & \frac{-1}{\sqrt{1-\cos^2y}}\\
& = & \frac{-1}{\sqrt{1-x^2}}
\end{eqnarray*}}
\newproblem{diffeasy:tan}{%
\(y = \tan x\)}{%
\begin{eqnarray*}
y & = & \tan x\\
& = & \frac{\sin x}{\cos x}\\
\frac{dy}{dx} & = & \frac{\cos x}{\cos x} + \sin x\times\frac{-1}{\cos^2x}\times -\sin x\\
& = & 1 + \tan^2x\\
& = & \sec^2x.
\end{eqnarray*}}
\newproblem{diffeasy:arctan}{%
\(y = \arctan x = \tan^{-1}x\)}{%
\[\tan y = x\]
diff w.r.t. $x$:
\begin{eqnarray*}
\sec^2y\frac{dy}{dx} & = & 1\\
\frac{dy}{dx} & = & \frac{1}{\sec^2y}\\
& = & \frac{1}{1+\tan^2y}\\
& = & \frac{1}{1+x^2}
\end{eqnarray*}}
\newproblem{diffeasy:cot}{%
\(y = (\tan x)^{-1} = \cot x\)}{%
\begin{eqnarray*}
\frac{dy}{dx} & = & -(\tan x)^{-2}\sec^2x\\
& = & -\frac{\cos^2x}{\sin^2x}\cdot\frac{1}{\cos^2x}\\
& = & \frac{-1}{\sin^2x}\\
& = & -\csc^2x.
\end{eqnarray*}}
\newproblem{diffeasy:cosxsqsinx}{%
$y = \cos(x^2)\sin x$.}{%
\[\frac{dy}{dx} = -\sin(x^2)2x\sin x + \cos(x^2)\cos x\]}
\newproblem{diffeasy:xlnx}{%
$y = (x+1)\ln(x+1)$.}{%
\begin{eqnarray*}
\frac{dy}{dx} & = & \ln(x+1) + \frac{x+1}{x+1}\\
& = & 1 + \ln(x+1).
\end{eqnarray*}}
\newproblem{diffeasy:glng}{%
$f(x) = g(x)\ln(g(x))$.}{%
\begin{eqnarray*}
f'(x) & = & g'(x)\ln(g(x)) + \frac{g(x)}{g(x)}g'(x)\\
& = & g'(x)(1+\ln(g(x))).
\end{eqnarray*}}
\newproblem{diffeasy:sinx/x}{%
$y = \frac{\sin x}{x}$.}{%
\[\frac{dy}{dx} = \frac{\cos x}{x} - \frac{\sin x}{x^2}\]}
\endinput
%%
%% End of file `easy.tex'.
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