若θ为第二象限角
则sinθ/|sinθ|+√1-sin^2θ/|cosθ|+tanθ/|tanθ|+cotθ/|cotθ|
=sinθ/sinθ+|cosθ|/|cosθ|-tanθ/tanθ-cotθ/cotθ
=1+1-1-1
=0
若θ为第二象限角,则sinθ/|sinθ|+√1-sin^2θ/|cosθ|+tanθ/|tanθ|+cotθ/|cot
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