函数y=3sin(x+20°)+5sin(x+80°)的最大值为 ______.
人气:402 ℃ 时间:2019-10-11 11:15:50
解答
y=3sin(x+20°)+5sin(x+80°)=3sin(x+20°)+5sin(x+20°+60°)=3sin(x+20°)+5[sin(x+20°)cos60°+cos(x+20°)sin60°]=3sin(x+20°)+52sin(x+20°)+532cos(x+20°)=112sin(x+20°)+532cos(...
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