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[" 29.If "x=cos(2t)" and "y=sin^(2)t," t...

[" 29.If "x=cos(2t)" and "y=sin^(2)t," then what is "(d^(2)y)/(dx^(2))" equal "],[" to? "],[[" (a) "0," (b) "sin(2t)," (c) "-cos(2t)," (d) "-(1)/(2)]]

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