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y =e^(2t)/2! -e^(4t)/4! +e^(6t)/6! -e^(8t)/8! +e^(10t)/10! -e^(12t)/12! and y=cos(e^t)
y =e^(2t)/2! -e^(4t)/4! +e^(6t)/6! -e^(8t)/8! +e^(10t)/10! -e^(12t)/12! and y=cos(e^t)
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