Tìm phương trình tiếp tuyến

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1. y'' - 2y' + 10y = 0, y(0) = 2; y'(0) = 1;
2. y'' - 2y' + 10y = 0, y(0) = 0, y'(0) = 0;
3. y'' + 9y = 0, y(0) = 2; y'(0) = 1;
4. y'' - y = 0, y(0) = 0, y'(0) = 0;
5. y'' + 2y' + 6y = 0, y(0) = 0, y'(0) = 0;
6. y'' + 5y' + 6y = 1;
7. y'' + 9y = e^x;
8. y'' + y = sin x;
9. y'' - 2y' + y = 3e^(-x);
10. y'' - 4y' + 4y = e^x/(e + 1);