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1 solution
=> 2 * { ( 2 * cos 20 * sin 20 ) - ( sin 60 * cos 20 )} / sin 20
=> 2 * { ( sin 40 - sin 60 * cos 20 ) / sin 20
=> 2 * { ( sin 60 * cos 20 - cos 60 * sin 20 - sin 60 * cos 20 ) / sin 20 ....................................[ sin 40 = sin ( 60 - 20 ) = sin 60 * cos 20 - sin 20 * cos 60 ]
=> -1