f(x) = 2sinxcos^2(P/2)+cosxsinP-sinx
= sinx(1+cosP)+cosxsinP-sinx
= sinxx + sinxcosP + cosxsinP - sinx
= sinxcosP+cosxsinP
= sin(x+P)
在x=π处取最小值，0
P=π/2
f(x) = sin(x+π/2) = cosx
f(A)=√3/2
A=π/6
a/sinA=b/sinB
sinB=bsinA/a = √2×1/2 /1 = √2/2
B=π/4，或3π/4
C=π-A-B=7π/12，或π/12
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