2023高三生怎么提高学习成绩 提分技巧有哪些答案

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4.已知a∈(0，π)，且2cos2a=cosa+cos2a,则sina=A号√5B.3cD.3【答案】B【解析】由2c0s2a=c0sa十c0s2a,即3cos2a-c0sa-2=0,得c0sa=-兰或c0sa=1.因为a∈(0，π)，所以coS a =-

It delighted me that my school will start a winter camp,which includes a variety of course,such as cooking,delightscoursesswimming,and giving first aid.To be honesty,I am interested in the course of giving first aid and I plan to signhonestup in it.forI choose to attend to the course due to the fact that first aid is greatly important to people.If a person getsinjured but needs medical care before a doctor can A found,every second counts in saving life,in which case theandbeknowledge of first aid can help save lives.Beside,I plan to study medicine and devote my life to medicalBesidesresearch.Hopeful the course will help me to learn about what to deal/what to deal with medical emergencies.Hopefullyhowdo