若函数fx=1+cos2x /4sin(π/2 +x)—asin( x/2) cos(π-π/2)的最大值为2,
若函数fx=1+cos2x /4sin(π/2 +x)—asin( x/2) cos(π-π/2)的最大值为2,
数学人气:763 ℃时间:2019-11-15 18:43:32
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原式=1/2COSX+asin(x/2)cos(x/2) =1/2COSX+a/2sinx =1/2(cosx+asinx) 因为最大值是2 所以(√1+a^2)/2=2 a=+ -√15
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