SIN15度+COS15度=?

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SIN15度+COS15度=?
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SIN15度+COS15度=?
SIN15度+COS15度=?

SIN15度+COS15度=?
(SIN15度+COS15度)^2=SIN^2 15度+COS^2 15度+2SIN15度COS15度=1+sin30度=1.5
所以,SIN15度+COS15度=(根号6)/2

sin15°+cos15°
=[(1-cos30°)/2]^(1/2)+[(1+cos30°)/2]^(1/2)
=[6^(1/2)-2^(1/2)]/4+[6^(1/2)+2^(1/2)]/4
=6^(1/2)/2

根号2(cos45sin15+cos15sin45)等于根号2sin60 结果为1