Sina+cosa=tana(0
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Sina+cosa=tana(0Sina+cosa=tana(0Sina+cosa=tana(0tana=sina+cosa=√2sin(a+π/4)∵0<a<π/2∴π/4<a+π/4<3π/4∴1
Sina+cosa=tana(0 Sina+cosa=tana(0
Sina+cosa=tana(0
tana = sina+cosa = √2sin(a+π/4)
∵ 0<a<π/2
∴ π/4<a+π/4<3π/4
∴ 1<√2sin(a+π/4)≤√2
∴ 1<tana≤√2
∴ π/4<a≤arctan√2
sinA+cosA=tanA(0
sinA+cosA=tanA(0
Sina+cosa=tana(0
sina+cosa=tana(0
设tanA= Sina-cosa / Sina+cosa且0
已知sina+cosa=tana(0
若sinA +cosA =tanA (0
若sina+cosa=tana 0度
若sina+cosa=tana 0度
若sinA+cosA=tanA(0
如果sinA+cosA=tanA(0
(cosa-sina)/(cosa+sina)=(1-tana)/(1+tana)
函数y=(|sinA|/sinA)+(cosA/|cosA|)+(|tanA|/tanA)∈?
为什么sina+cosa/sina-cosa =tana+1/tana-1
sinA=?,cosA还是tanA
-tana=cosa,求sina
tana=3,sina.cosa
(tana-3)(sina+cosa+3=0) 那么4sina-2cosa/5cosa+3sina 的值是多少(tana-3)(sina+cosa+3=0) 那么4sina-2cosa/5cosa+3sina的值是多少