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ngocb0688
2 năm trước
Tính sin(a - π/4), biết cosa = -4/5; a nằm trong khoảng (π, -3π/2)
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Các câu hỏi liên quan

1." The Earth is being threatened and the future looks bad" →The journalist reported that.... 2. " Pollution is a serious problem that needs to be taken care of immediately" → I was reminded that..... 3." I will participate in the preservation of water" → She promised that.... 4." All of us should save our great forests from fire" → The scientists advised that.... 5." I used a lot of pesticides for vegetable yesterday " → She confessed that... 6." Mass fish deaths had been discovered on the beaches of Ha Tinh, Quang Tri, Quang Ninh and Hue" → He told that.... 7."trees on Hanoi streets should be preserved to keep cool air" → A local person said that.... 8." Students should throw rubbish into the bin" → the principal reminded that... 9. " there is excessive lead in soil of some areas but local people still use it to grow vegetables" → she complained that 10." There have been many reports about deforestation which contributes to the disappearance of large areas of tropical rainforest" → she said that....

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