tan225*cos240*sin(-60)*tan(-30)

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tan225*cos240*sin(-60)*tan(-30)tan225*cos240*sin(-60)*tan(-30)tan225*cos240*sin(-60)*tan(-30)tan225°

tan225*cos240*sin(-60)*tan(-30)
tan225*cos240*sin(-60)*tan(-30)

tan225*cos240*sin(-60)*tan(-30)
tan225°*cos240°*sin(-60°)*tan(-30°)
=tan(180°+45°)*cos(180°+60°)*(-sin60°)*(-tan30°)
=tan45°*(-cos60°)*sin60°*tan30°
=1*(-1/2)*(根号3)/2 *(根号3)/3
=-1/4