вычислить:
sin п-tg 3п/4
tgп*ctgп/4+cosп/2*sin(-2п/3)
sin 150-соs 720+ tg 225
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вычислить:
sin п-tg 3п/4
tgп*ctgп/4+cosп/2*sin(-2п/3)
sin 150-соs 720+ tg 225
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Answers & Comments
1) sin п-tg 3п/4 = 0 - (-1) = 1
2) tgп*ctgп/4+cosп/2*sin(-2п/3) = 0
3) sin 150-соs 720+ tg 225 = sin(180-30)-cos360+tg(270-45)=-(1/2)-1-1=-2,5