sin(a+180度)cos(-a)sin(-a-180度)化简

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sin(a+180度)cos(-a)sin(-a-180度)化简
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sin(a+180度)cos(-a)sin(-a-180度)化简
sin(a+180度)cos(-a)sin(-a-180度)化简

sin(a+180度)cos(-a)sin(-a-180度)化简
=-sinacosasina=-(sina)^2cosa

sin(a+180度)cos(-a)sin(-a-180度)
= -sin(a)cos(a)sin(a)
= -sin(a)(1/2)sin(2a)
= -(1/2)sin(a)sin(2a)

-sinacosa(-sin[a+180)]
=sinacosa(-sina)
=-sin^2acosa
基本应用奇变偶不变,符号看象限
还有就是:负角的三角函数诱导变化

sin(a+180)cos(-a)sin(-a-180)=-sin(a)cos(a)sin(a+180)=-sinacosa(-sina)=sin2acosa

sin(a+180度)cos(-a)sin(-a-180度)
= - sin (a)cos( a )*sin( a)
= - [sin (a)]^2 * cos (a )

sin(a+180)cos(-a)sin(-a-180)
= (-sin a)*(cos a )*(sin a)
=-sin^2 a * cos a