设平面向量a=(cosx,sinx),b=(cosx+2根号3,sinx),c=(sina,cosa),x∈R

a=(cosx,sinx), b=(cosx+2√3,sinx), c=(sina,cosa)let direction of x be idirection of y be jdirection of x be ka = (cosx) i + (sinx) jb = (cosx+2√3) i + ( sinx) j axb = {(cosx) i + (sinx)j }x...