求人教版数学必修四P137 13化简的(7)——(9)题 (7)sin(a+b)cos(γ-b)-cos(b+a)sin(b-γ)(8)sin(a-b)cos(b-γ)-cos(a-b)sin(γ-b)(9)tan5π/4+tan5π/12 / 1-tan5π/12
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![求人教版数学必修四P137 13化简的(7)——(9)题 (7)sin(a+b)cos(γ-b)-cos(b+a)sin(b-γ)(8)sin(a-b)cos(b-γ)-cos(a-b)sin(γ-b)(9)tan5π/4+tan5π/12 / 1-tan5π/12](/uploads/image/z/1058671-55-1.jpg?t=%E6%B1%82%E4%BA%BA%E6%95%99%E7%89%88%E6%95%B0%E5%AD%A6%E5%BF%85%E4%BF%AE%E5%9B%9BP137+13%E5%8C%96%E7%AE%80%E7%9A%84%EF%BC%887%EF%BC%89%E2%80%94%E2%80%94%EF%BC%889%EF%BC%89%E9%A2%98+%EF%BC%887%EF%BC%89sin%28a%2Bb%29cos%28%CE%B3-b%29-cos%28b%2Ba%29sin%28b-%CE%B3%29%EF%BC%888%EF%BC%89sin%28a-b%29cos%28b-%CE%B3%29-cos%28a-b%29sin%28%CE%B3-b%29%EF%BC%889%EF%BC%89tan5%CF%80%2F4%2Btan5%CF%80%2F12+%2F+1-tan5%CF%80%2F12)
求人教版数学必修四P137 13化简的(7)——(9)题 (7)sin(a+b)cos(γ-b)-cos(b+a)sin(b-γ)(8)sin(a-b)cos(b-γ)-cos(a-b)sin(γ-b)(9)tan5π/4+tan5π/12 / 1-tan5π/12
求人教版数学必修四P137 13化简的(7)——(9)题
(7)sin(a+b)cos(γ-b)-cos(b+a)sin(b-γ)
(8)sin(a-b)cos(b-γ)-cos(a-b)sin(γ-b)
(9)tan5π/4+tan5π/12 / 1-tan5π/12
求人教版数学必修四P137 13化简的(7)——(9)题 (7)sin(a+b)cos(γ-b)-cos(b+a)sin(b-γ)(8)sin(a-b)cos(b-γ)-cos(a-b)sin(γ-b)(9)tan5π/4+tan5π/12 / 1-tan5π/12
(7) =sin(a+b)cos(b-y)-cos(a+b)sin(b-γ)=sin(a+b-(b-y))=sin(a-y) ;
(8) =sin(a-b)cos(y-b)-cos(a-b)sin(γ-b) =sin(a-b-(y-b))=sin(a-y) ;
(9) =(tanπ/4+tan5π/12) /( 1-tan5π/12)=tan(π/4+5π/12)=tan(8π/12)=tan(2π/3)=根号3 ;
求人教版数学必修四P137 13化简的(7)——(9)题 (7)sin(a+b)cos(γ-b)-cos(b+a)sin(b-γ)(8)sin(a-b)cos(b-γ)-cos(a-b)sin(γ-b)(9)tan5π/4+tan5π/12 / 1-tan5π/12
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