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[" ple "20." If "x=cos theta" and "y=sin...

[" ple "20." If "x=cos theta" and "y=sin^(3)theta," then prove that "],[qquad y(d^(2)y)/(dx^(2))+((dy)/(dx))^(2)=3sin^(2)theta(5cos^(2)theta-1)]

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