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|[cos(x-a),cos(x+a),cos x],[sin(x+a),sin...

|[cos(x-a),cos(x+a),cos x],[sin(x+a),sin(x-a),sin x],[cos(tan x,cos a cot x,cosec2x]|<=0

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sin_( if )x+sin2x+sin3x=cos x+cos2x+cos3x