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Tính 1: sin x = sin 20 2: tan x = tan 25° 3: cot x = cot 100° 4: sin 2x = sin 40° 5: cos 3x = cos 75° 6: tan 4x = tan π/3 7: cot 2x = cot π/12 |
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Answer» ong>Step-by-step explanation: |
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