化简：sin^2a+sin^2β-sin^2asin^2β+cos^2acos^2β

sin^2(-a)化简 化简sin^2a+sin^β-sin^2a*sin^2β+cos^2a*cos^β 化简sin^2α+sin^2β+2sinαsinβcos(α+β) 化简sin(α+β)+sin(α-β)+2sinαsin(3π/2-β)= 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(α+β)-2sinαsinβ/2sinαsinβ+cos(α+β) 化简:sin(-a)cos(2π+a)sin(-a-π) 化简Sin A + Sin 2A / 1+cos A + 【证明】Sin A+sin B=2Sin 22 sin(arccos(2sin(a)))= 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) 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