| Obtained solutions | Liu et al. [48] solutions |
| (i) If , and , then the solution is . | (i) If , then the solution is . |
| (ii) If , and , then the solution is . | (ii) If , , , then the solution is . |
| (iii) If , , and , then the solution is . | (iii) If , then the solution is . |
| (iv) If , and , then the solution is . | (iv) If , then the solution is . |
| (v) If , and , then the solution is . | (v) If , then the solution is . |
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(vi) If , , and , then the solution is . | (vi) If , then the solution is . |
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