化简sin(a-β)cosβ+cos(a-β)sinβ得

化简sin(a-β)cosβ+cos(a-β)sinβ得 化简sin^2a+sin^β-sin^2a*sin^2β+cos^2a*cos^β 化简sin a+cos a sin(α+β)cos(r-β)-cos(β+a)sin(β-r) 化简 证明cos(a+β)cos(a-β)=cos^2a-sin^2β 化简(sin a^2/cos a +cos a)*cot a 化简tan a(cos a-sin a)+sin a(sin a+tan a)/1+cos a sin(a+β)cos(a-β)=sinacosa+sinβcosβ马上解决啊 化简COS(a+B)COS(a-B)+sin平方B 化简cos(a+b)cos(a-b)+sin^2b cos方α-cos方β=a 求sin(α+β)*sin(α-β) 已知向量a=(cosα,sinα),b=(cosβ,sinβ),0 已知a=(cosα,sinα).b=(cosβ,sinβ),0 已知cosα+cosβ=a,sinα+sinβ=b,且0 设向量a=(cosα,sinα),b=(cosβ,sinβ),且0 设向量a=(cosα,sinα),b=(cosβ,sinβ),且0 1.已知a=(cosα,sinα),b=(cosβ,sinβ),(0 设向量a=(cosα,sinα),b=(cosβ,sinβ),且0