化简:sin^4a+cos^2a-sin^2a-cos^4a
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(1-sin^4a-cos^4)/(sin^2a-sin^4a) 化简
化简:sin^4a+cos^2a-sin^2a-cos^4a
sin^4+sin^2cos^2+cos^2a=
化简:sin(-a)cos(2π+a)sin(-a-π)
化简Sin A + Sin 2A / 1+cos A +
cos^4A-sin^4a 化简
化简sin^2a-cos^2a
化简sin(a/2)cos(a/2)
化简sin a+cos a
化简(sin a^2/cos a +cos a)*cot a
化简sin^2a+sin^2b-sin^2a*sin^2b+cos^2a*cos^2b
sin^2a+sin^2b-sin^2a * sin^2b+cos^2a * cos^2b 化简
化简sin^2a+sin^β-sin^2a*sin^2β+cos^2a*cos^β
化简 1-sin^4a-cos^4a/cos^2a-cos^4a
化简sin(A+π/4)sin(A-π/4)/sin^4A-cos^4A
化简(1-sin^6 a-cos^6 a)/(cos^2 a-cos^4 a)==
(cos a)^4+(sin a)^2*(sin a)^2+(sin a)^2=?
cosA+cos^2A=1,sin^2A+sin^4A+sin^8A