求f(x)=2cos2x(是2COS平方2x)sinx除sinx+1的值域
求f(x)=2cos2x(是2COS平方2x)sinx除sinx+1的值域
數(shù)學(xué)人氣:713 ℃時間:2020-06-20 06:16:01
優(yōu)質(zhì)解答
cosx^2=1-sinx^2f(x)=2cosx^2*sinx/(sinx+1)=2(1-sinx^2)*sinx/(sinx+1)=2(1+sinx)(1-sinx)*sinx/(sinx+1)=2(1-sinx)*sinx=-2(sinx^2-sinx+1/4)+1/2=-2(sinx-1/2)^2+1/2-1
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