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（浙江专用）2020版高考数学大一轮复习课时174.2同角三角函数的基本关系和诱导公式教师备用题库.docx

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（浙江专用）2020版高考数学大一轮复习课时174.2同角三角函数的基本关系和诱导公式教师备用题库.docx_第1页
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14.2 同角三角函数的基本关系和诱导公式教师专用真题精编(2018 课标全国理,15,5 分)已知 sin +cos =1,cos +sin =0,则 sin(+)= . 答案 -12解析 本题主要考查两角和与差的正弦公式 .由 sin +cos =1,cos +sin =0,两式平方相加,得 2+2sin cos +2cos sin =1,整理得 sin(+)=- .12

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