化简：sin^4a+cos^2a-sin^2a-cos^4a

(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