化简,4sin^2a(1-sin^2a)+cos^22a,
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(1-sin^4a-cos^4)/(sin^2a-sin^4a) 化简
化简Sin A + Sin 2A / 1+cos A +
cosA+cos^2A=1,sin^2A+sin^4A+sin^8A
(1-sin^6a-cos^6a)/(sin^2a-sin^4a)
sin^2(-a)化简
化简,4sin^2a(1-sin^2a)+cos^22a,
求证1+sin a+cos a+2sin acos a/1+sin a+cos a=sin a+cos a
化简:sin(-a)cos(2π+a)sin(-a-π)
化简sin^(a-30°)+sin^(a+30°)-sin^a化简sin^2(a-30°)+sin^2(a+30°)-sin^2a
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
(cos a)^4+(sin a)^2*(sin a)^2+(sin a)^2=?
(1-sin^6 a-cos^6 a)/(sin^2 a-sin^4 a)的化简结果,
急.三角函数:化简(sin^2a*cos^4a+sin^4acos^2a)/(1-sin^4a-cos^4a)
sin^(丌/4-a)+sin^2(丌/4+a)
懂得进.证明,sina+sin(a+b)+sin(a+2b)+...sin(a+nb)=sin(a+ab/2)sin[(n+1)b/2]/sin(b/2)
化简:sin^4a+cos^2a-sin^2a-cos^4a
化简sin(-A-2派)