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10 punti.. sn gli esercizi del compito in classe di stamattina a sorpresa..cm li avreste risolti?
4sen630 +4sen90 - 2cos180
tg540 - 3sen270 + cotg90
sen180 - cos1440 +tg0 -sen270
5cos90 -3cos180 +2sen450
(cos60 + sen30)(tg45 +tg60 - 3tg30)
1 Answer
- 1 decade agoFavorite Answer
1) 4 * sen(630) + 4 * sen(90) - 2 * cos(180) =
= 4 * sen(360 + 180 + 90) + 4 * 1 - 2 * (-1) =
= 4 * (-1) + 4 + 2 = -4 + 4 + 2 = 2
2) tg(540) - 3 * sen(270) + cotg(90) =
= tg(360 + 180) - 3 * sen(180 + 90) + 0 =
= 0 - 3 * (-1) + 0 = 3
3) sen(180) - cos(1440) + tg(0) - sen(270) =
= 0 - cos(360 * 4) + 0 - (-1) =
= -1 + 1 = 0
4) 5 * cos(90) - 3 * cos(180) + 2 * sen(450) =
= 5 * 0 - 3 * (-1) + 2 * sen(360 + 90) =
= 3 + 2 * 1 = 5
5) (cos(60) + sen(30)) * (tg(45) + tg(60) - 3 * tg(30)) =
= (1/2 + 1/2) * (1 + sqrt(3) - 3 * sqrt(3) / 3) =
= (1) * (1 + sqrt(3) - sqrt(3))
= (1) * (1) = 1
sqrt è la radice quadrata
