tana=2,则sin(a+3兀)+cos(兀+a)/sin(-a)-cos(兀+a)=
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tana=2,则sin(a+3兀)+cos(兀+a)/sin(-a)-cos(兀+a)=
tana=2,则sin(a+3兀)+cos(兀+a)/sin(-a)-cos(兀+a)=
tana=2,则sin(a+3兀)+cos(兀+a)/sin(-a)-cos(兀+a)=
原式=(-sina-cosa)/(-sina+cosa)
上下除以cosa
=(-tana-1)/(-tana+1)
=3
tana=2,则sin(a+3兀)+cos(兀+a)/sin(-a)-cos(兀+a)=
sin(a+b)=1/2,sin(a-b)=1/3,则tana/tanb=?
sin(a+b)=1/2,sin(a-b)=1/3,则tana/tanb=?
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