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sin30 ° sin60 ° sin120 ° sin150 ° sin210°
Cos60° Cosψ +Sin60° Sinψ Cos60° Cosψ -Sin60° Sinψ Sin60° Cosψ -Cos60° Sinψ Sin60° Cosψ +Cos60° Sinψ
2sin α cos β= sin( α+β) +sin( α-β) 2sin α cos β= cos( α+β) +sin( α-β) . 2sin α cos β= sin( α+β) -sin( α-β) 2sin α cos β= cos( α+β) -sin( α-β)
sin( α+β)= sin α? cos β- cos α? sin β sin( α+β)= sin α? cos β+ cos α? sin β sin( α+β)= cos α? cos β+ sin α? sin β sin( α+β)= cos α? cos β- sin α? sin β
sin α+sin β= 2sin( 2 )cos( 2 ) sin α+sin β= 2cos( 2 )sin( 2 ) sin α+sin β= 2cos( 2 )cos( 2 ) sin α+sin β= 2cos( 2 )sin( 2 )
Sin30 Sin(30) Sin(30°) Sin(30*3.14/180)
sin(α+β)>sinα+sinβ cos(α+β)>cosαcosβ sin(α+β)>sin(α-β) cos(α+β)>cos(α-β)
sin2 α= 2sin α? cos α sin2 α= 21(1- cos2 α) sin2 α= 21(1+ cos2 α) sin2 α= 21sin αcosα
cos α-cos β=- 2sin( 2 )sin( 2 ) cos α-cos β= 2sin( 2 )sin( 2 ) cos α-cos β= -2sin(2)sin(2) cos α-cos β= 2sin( 2 )sin( 2 )
sin 11°sin 168°sin 11°sin 168°
f'(sin2x)sin 2s f'(sin2x) 2sin xf'(sin2x) 2f'(sin2x)
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
(A) SIN(30°) (B) SIN(π/6) (C) SIN(0.523) (D) SIN(π+30°)
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)