化简：sin^2a+sin^2(a-180/3)+sin^2(a+180/3)
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化简：sin^2a+sin^2(a-180/3)+sin^2(a+180/3)化简：sin^2a+sin^2(a-180/3)+sin^2(a+180/3)化简：sin^2a+sin^2(a-180/
化简：sin^2a+sin^2(a-180/3)+sin^2(a+180/3)
化简：sin^2a+sin^2(a-180/3)+sin^2(a+180/3)
化简：sin^2a+sin^2(a-180/3)+sin^2(a+180/3)
sin^2a+sin^2(a-180°/3)+sin^2(a+180°/3)
=1-cos2a+1-cos2(a-180°/3)+1-cos2(a+180°/3)
=3-cos2a-[cos2(a-180°/3)+cos2(a+180°/3)]
=3-cos2a-[cos(2a-120°)+cos(2a+120°)]
=3-cos2a-2cos2acos120°
=3-cos2a+2cos2acos60°
=3-cos2a+cos2a
=3
sin^2(-a)化简
化简:sin(-a)cos(2π+a)sin(-a-π)
化简Sin A + Sin 2A / 1+cos A +
化简sin^(a-30°)+sin^(a+30°)-sin^a化简sin^2(a-30°)+sin^2(a+30°)-sin^2a
化简sin(-A-2派)
化简sin(2π+a)
化简（sin(a-b)-2sin a cos b）/2sin a sin b +coa(a+b)
化简：sin^2a+sin^2(a-180/3)+sin^2(a+180/3)
化简：sin^2(A-30)+sin^2(A+30)-sin^2A
化简；sin^2 A+sin^2(A-π/3)+sin^2(A+π/3)
(1-sin^4a-cos^4)/(sin^2a-sin^4a) 化简
化简sin^2A+sin^(A-π/3)+sin(A+π/3)
若sin^2a
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
sin(arccos(2sin(a)))=
化简sin^2a+sin^β-sin^2a*sin^2β+cos^2a*cos^β
【证明】Sin A+sin B=2Sin 22