cos(25π/3) = cos(8π+π/3) = cos(π/3) = 1/2 ；tan(-15π/4) = tan(-4π+π/4) = tan(π/4) = 1 ； sin810°+tan765°-cos360°= sin(720°+90°)+tan(720°+45°)-cos0°= sin(90°)+tan(45°)-1= 1+1-1= 1 .希望对你有用；满意请采纳，谢谢~
