1)if 1-cosy=0.2 and
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1)if 1-cosy=0.2 and
1)if 1-cosy=0.2 and
1)if 1-cosy=0.2 and
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1)if 1-cosy=0.2 and
已知sinx+siny=1/3,求sinx-cosy*cosy的最大值和最小值.
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cosx*cosy=1,sin(x+y)=?
cosx+cosy=1,则sinx+siny的范围
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cosx+cosy=1/2,sinx-siny=1/3,则cos(x+y)=?
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sinx+cosy=1/3 cosx+siny=1/6 则sin(x+y)=?RT
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