korzystasz z wzorów redukcyjnych
tg300 = tg(270+30) = -ctg 30 = -√3
cos 240 = cos(180+60_ = -cos60 = -1/2
sin 135 = sin(90+45) = cos45 = √2/2
ctg 315 = ctg(270+45) = -tg45 = -1
-√3* -1/2 + √2/2 * -1 = √3/2 - √2/2 = (√3 -√2)/2
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korzystasz z wzorów redukcyjnych
tg300 = tg(270+30) = -ctg 30 = -√3
cos 240 = cos(180+60_ = -cos60 = -1/2
sin 135 = sin(90+45) = cos45 = √2/2
ctg 315 = ctg(270+45) = -tg45 = -1
-√3* -1/2 + √2/2 * -1 = √3/2 - √2/2 = (√3 -√2)/2