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| 1. |
2sin68°/cos22°-2cot15°/5tan75°-(3tan45°tan20°tan40°tan50°tan70°)/5 |
| Answer» 2sin(90°-22°)/cos22°-2cot(90°-75°)/5tan75°-(3tan45°tan20°tan40°tan50°tan70°)/5= 2cos22°/cos22°- 2tan75°/5tan75°- 3/5= 2-2/5-3/5= 8/5-3/5= 5/5=1 | |