sin690°Xsin150°+cos930°Xcos( -270°)+tan120°Xtan1050°求解!

sin690°Xsin150°+cos930°Xcos( -270°)+tan120°Xtan1050°
=sin(720-30)Xsin(180-30)°+cos(720+180+30)°Xcos( -270°)-tan60°Xtan(1080-30)°
=SIN30SIN30-COS30COS(-90)+TAN60TAN30
=1/4-0+1
=5/4