sin 120-cos 225+tg300-ctg 150=
sin 120= sin (90+30)= cos 30
cos 225= cos (180+45)= - cos 45
tg 300= tg (270+30)= - ctg 30
ctg 150=ctg (90+60)= -tg 60
sin 120- cos 225 + tg 300 - ctg 150=
= cos30 - (-cos 45)+ (-ctg 30)- (-tg 60)=
=
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sin 120= sin (90+30)= cos 30
cos 225= cos (180+45)= - cos 45
tg 300= tg (270+30)= - ctg 30
ctg 150=ctg (90+60)= -tg 60
sin 120- cos 225 + tg 300 - ctg 150=
= cos30 - (-cos 45)+ (-ctg 30)- (-tg 60)=
=