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  • 若f(n)=sin(nπ)/6,n∈N試求:f(1)*f(3)*f(5)*f(7)*…*f(101)的值

    若f(n)=sin(nπ)/6,n∈N試求:f(1)*f(3)*f(5)*f(7)*…*f(101)的值
    麻煩寫(xiě)上解答過(guò)程,拜托了!
    數(shù)學(xué)人氣:979 ℃時(shí)間:2020-05-14 23:11:03
    優(yōu)質(zhì)解答
    解析:∵sin(π/6)sin(3π/6)sin(5π/6)
    sin(7π/6)sin(9π/6)sin(11π/6)
    =sin(π/6)sin(π/2)sin(π/6)sin(-π/6)
    sin(3π/2)sin(-π/6)=1/2*1*1/2*(-1/2)*(-1)*(-1/2)=-1/2^4
    而sin(π/6)sin(3π/6)sin(5π/6)
    sin(7π/6)sin(9π/6)sin(11π/6)
    =sin(13π/6)sin(15π/6)sin(17π/6)
    sin(19π/6)sin(21π/6)sin(23π/6)
    =……=sin(85π/6)sin(87π/6)sin(89π/6)
    sin(91π/6)sin(93π/6)sin(95π/6)
    (sin(97π/6)=sin(π/6)=1/2
    sin(99π/6)=sin(π/2)=1,
    sin(101π/6)=sin(5π/6)=1/2
    ∴f(1)*f(3)*f(5)*f(7)*…*f(101)
    =sin(π/6)sin(3π/6)sin(5π/6)
    sin(7π/6)sin(9π/6)sin(11π/6)……sin(95π/6)sin(97π/6)sin(99π/6)sin(101π/6)
    =(-1/2^4)^8*1/2*1*1/2
    =1/2^32*1/4
    1/2^34
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