条件:(1)θ是第二象限角(5)sinθ/2-cosθ/2=-1/5.
此时解得sinθ/2=3/5 cosθ/2=4/5,结论tanθ/2=3/4
条件:(1)θ是第二象限角(4)tanθ/2=3/4此时解得sinθ/2=3/5 cosθ/2=4/5,结论(5)sinθ/2-cosθ/2=-1/5.
条件:(1)θ是第二象限角(5)sinθ/2-cosθ/2=-1/5.
此时解得sinθ/2=3/5 cosθ/2=4/5,结论tanθ/2=3/4
条件:(1)θ是第二象限角(4)tanθ/2=3/4此时解得sinθ/2=3/5 cosθ/2=4/5,结论(5)sinθ/2-cosθ/2=-1/5.