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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)
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)
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)
2/3*SIN（3.1415926/4） 2.0*SIN（π/4）／6.0 2*SIN（3.1415926/4）/3 2.0/3*SIN（PI／4.0）
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 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 )
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 )
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)
2.0*SIN(π/4)／6.0 2*SIN(3.1415926/4)/3 2/3*SIN(3.1415926/4) 2.0/3*SIN(PI／4.0)
sin2－cos2 cos2－sin2 ±(sin2－cos2) sin2＋cos2
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
sin（1.5）＞sin3＞cos2 sin（1.5）＜sin3＜cos2
sin3＜sin（1.5）＜cos2 sin3＜cos2＜sin（1.5）
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)
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