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(1)-25π/6 =24π/6-π/6 =-4π-π/6 =-6π+2π-π/6 =-6π+11π/6 (2)-5π =-6π+π (3)-45° =-π/4 =-2π+7π/4 (4)400° =400/180 *π =2π+2π/9
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