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计算cos300°的值(  )

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doubled=Math.cos(42);  doubled=Math.cosine(42);  doubled=Math.cos(Math.toRadians(42));  doubled=Math.cos(Math.toDegrees(42));  
double d = Mat cos(42);  double d = Mat cosine(42);  double d = Mat cos(Mat toRadians(42));  double d = Mat cos(Mat toDegrees(42));  
double d=Math.cos(42);  double d= Math.cosine(42);  double d=Math.cos(Math.toRadians(42));  double d=Math.cos(Math.toDcgrees(42));  
double d = Math. cos(42);  double d = Math. cosine(42);  double d = Math. cos(Math. toRadians(42));  double d = Math. cos(Math. toDegrees(42));  
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double d=Math.cos(42);  double d=Math.cosine(42);  doubb d=Math.cos(Math.toRadians(42));  double d=Math.cos(Math.toDegrees(42));  
sin(30*pi/180)  sin(30*pi/360)  COS(30*pi/l80)  COS(30'pi/360)  
S=Qcos300(拉力)  S=Pcos450(拉力)  S=-Q/cos300(压力)  S=-P/cos450(压力)  
double d=Math.cos(42);  double d=Math.cosine(42);  double d=Math.cos(Math.toRadians(42) );  double d=Math.cos(Math.toDegrees(42) );  
double d=Math.cos(45);  double d=Math.cosine(45);  double d=Math.cos (Math.toRadians(45));  double d=Math.cos (Math.toDegress(45));  

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