若x、y是锐角且tanx=2/3tany=3/4则sin(x+y)等于
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若x、y是锐角且tanx=2/3tany=3/4则sin(x+y)等于
若x、y是锐角且tanx=2/3tany=3/4则sin(x+y)等于
若x、y是锐角且tanx=2/3tany=3/4则sin(x+y)等于