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sin 2α+cos2α=1 sin 2α-cos2α=1 sin 2α+cos2α=-1 sin 2α-cos2α=-1
1/3*sin(1/2)*sin(1/2) sin(0.5)*sin(0.5)/3 pow(sin(0.5),2)/3 1/3.0*pow(sin(1.0.2),2)
1/3*sin(1/2)*sin(1/2) sin(0.5)*sin(0.5)/3 pow(sin(0.5),2)/3 1/3.0*pow(sin(1.0/2),2)
sin 2α= 2sin α cos α sin 2α= cos2α-sin 2α sin 2α= 21(1+ cos2 α) sin 2α= 21(1- cos2 α)
1/3*sin(1/2)*sin(1/2) sin(0.5)*sin(0.5)/3 pow(sin(0.5),2)/3 1/3.0*pow(sin(1.0.2),2)
1/3*sin(1/2)*sin(1/2) sin(0.5)*sin(0.5)/3 pow(sin(0.5),2)/3 1/3.0*pow(sin(1.0/2),2)
0.5*SIN(1/2)*2 SIN(0.5)**2/2 0.5(SIN(1/2))**2 (SIN**2)(1/2)/2
-1 0 1
sin2 α= 2sin α? cos α sin2 α= 21(1- cos2 α) sin2 α= 21(1+ cos2 α) sin2 α= 21sin αcosα
1/3*sin(1/2)*sin(1/2) sin(0.5)*sin(0.5)/3 pow(sin(0.5),2)/3 1/3.0*pow(sin(1.0/2),2)
1/3*sin(1/2)*sin(1/2) sin(0.5)*sin(0.5)/3 pow(sin(0.5),2)/3 1/3.0*pow(sin(1.0/2),2)
sin 2 =± 2cos 1 sin 2 = ± 2cos 1 sin 2 =± 2sin 1 sin 2 = ± 2sin 1
定义域是[-1,1] 是偶函数 值域是[-sin 1,sin 1] 不是周期函数
1/sinα 1/cosα cosα/sinα sinα/cosα
1/3,sin(1/2)*sin(1/2) sin(0.5)*sin(0.5)/3 pow(sin(0.5),2)/3 1/3.0*pow(sin(1.0/2),2)
¬p:∃x0∈R,sin x0≥1 ¬p:∀x∈R,sin x≥1 ¬p:∃x0∈R,sin x0>1 ¬p:∀x∈R,sin x>1
1/3*sin(1/2)*sin(1/2) sin(0.5)*sin(0.5)/3 pow(sin(0.5),2)/3 1/3.0*pow(sin(1.0/2),2)