sin810°+cos765°+cos360°+sin1125°
问题描述:
sin810°+cos765°+cos360°+sin1125°
答
结果等于2+根号2过程sin810°=sin(360°*2+90°)=sin(90°)cos765°=cos(360°*2+45°)=cos(45°)=(根号2)/2cos360°=cos0°=1sin1125°=sin(360°*3+45°)=sin(45°)=(根号2)/2