下列不能正确表示代数式2abcd的C语言表达式是( )。

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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)

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)

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)

sqrt(abs(n^x+e^) sqrt(fabs(pow(n，+pow(x，)) sqrt(fabs(pow(n，+exp()) sqrt(fabs(pow(x，+exp())

2*a*b/c/d a*b/c/d*2 a/c/d*b*2 2*a*b/c*d

sqrt(abs(n^x+e^x)) sqrt(fabs(pow(n，x)+pow(x，e))) sqrt(fabs(pow(n，x)+exp(x))) sqrt(fabs(pow(x，n)+exp(x)))

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*a*b/c/d a*b/c/d*2 a/c/d*b*2 2*a*b/c*d

4*a*b/c/e a*b/c/e*4 a/c/e*b*4 4*a*b/c*e

4 * c * d/a/b c * d/a/b* 4 c/a/b * d* 4 4* c* d/a, b

sqrt(abs(n^x+e^x)) sqrt(fabs(pow(n，x)+pow(x，e))) sqrt(fabs(pow(n，x)+exp(x))) sqrt(fabs(pow(x，n)+exp(x)))

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)