化简:√ (1-2sin a/2 *cosa/2)+√ (1+2sin a/2 *cos a/2)【0
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化简:√ (1-2sin a/2 *cosa/2)+√ (1+2sin a/2 *cos a/2)【0
化简:√ (1-2sin a/2 *cosa/2)+√ (1+2sin a/2 *cos a/2)【0
化简:√ (1-2sin a/2 *cosa/2)+√ (1+2sin a/2 *cos a/2)【0
=√ (sin²a/2-2sin a/2 *cosa/2+cos²a/2)+√ (sin²a/2+2sin a/2 *cos a/2+cos²a/2)
=√(sina/2-cosa/2)²+√(sina/2+cosa/2)
=cosa/2-sina/2+sina/2+cosa/2
=2cosa/2
化简Sin A + Sin 2A / 1+cos A +
(1-sin^4a-cos^4)/(sin^2a-sin^4a) 化简
sin^2(-a)化简
化简 (1+sin a+ cos a)(sin a/2 - cos a/2) / √(2+2cos a)(180°
化简:sin(-a)cos(2π+a)sin(-a-π)
求证1+sin a+cos a+2sin acos a/1+sin a+cos a=sin a+cos a
sin a+sin 2a /1+cos a+cos 2a 化简.
化简:√ (1-2sin a/2 *cosa/2)+√ (1+2sin a/2 *cos a/2)【0
化简sin^(a-30°)+sin^(a+30°)-sin^a化简sin^2(a-30°)+sin^2(a+30°)-sin^2a
已知a属于(pai/2,pai),化简:(sin²a/1-cosa)+√(1-sin²a)
sin 2a+2sin方a/ 1+tan a =2sin a cos a
求证:sin 2a/1+sin a+cos a=sin a+cos a-1急
Sin(π+2a)/(1+cos2a) 化简.
化简;1+cos2a+sin^2a=
化简,4sin^2a(1-sin^2a)+cos^22a,
化简1+sin(a-2π)*sin(π+a)-2cos平方(-a)
化简1+sin(a-2π)*sin(π+a)-2cos(-a)
cosA+cos^2A=1,sin^2A+sin^4A+sin^8A