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①。y=2a√(25-ax²)
dy/dx=2a·(-2ax)/[2√(25-ax²)]=-2a²x/√(25-ax²);
②。y=(x+r)√(r²-x²)
dy/dx=√(r²-x²)-2x(x+r)/[2√(r²-x²)]=√(r²-x²)-x(x+r)/√(r²-x²)
=√(r²-x²)-x(x+r)√(r²-x²)/(r+x)(r-x)
=√(r²-x²)-[x√(r²-x²)]/(r-x)=[1-x/(r-x)]√(r²-x²)
=[(r-2x)/(r-x)]√(r²-x²)
dy/dx=2a·(-2ax)/[2√(25-ax²)]=-2a²x/√(25-ax²);
②。y=(x+r)√(r²-x²)
dy/dx=√(r²-x²)-2x(x+r)/[2√(r²-x²)]=√(r²-x²)-x(x+r)/√(r²-x²)
=√(r²-x²)-x(x+r)√(r²-x²)/(r+x)(r-x)
=√(r²-x²)-[x√(r²-x²)]/(r-x)=[1-x/(r-x)]√(r²-x²)
=[(r-2x)/(r-x)]√(r²-x²)
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