Разложение на множители, возведение в степень

1. (7+9х/4)+(2х/3)=7х+1 (28+9х)/4 + 2х/3 = 7х+1 84+27х+8х=84х+12 84-12=84х-27х-8х 72=49х Х=72/49
2. (7-6х/2)+10х < (8х+1/2)-12 (14-6х+20х)/2 < (16х+1-24)/2 14+14х < 16х-23 Х ≥ 37/2 Х € [37/2; + ∞)
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2. sin (900 -t)+ cos (1800 +t)+tg(2700 +t)+сtg(3600 +t) = cos t + (-cost) – ctg t + ctgt = 0
arcsin (√3) /2+ arccos (√ 3) /2 = π/3 + π/6 = 3π/6 = π/2 arc cos (-1/2)- arc sin (-1) = 2π/3 – (-π/2) = 7π/6
sin х-1/2=0 sin x = ½ arcsin x = arcsin ½ x = π/6
6. сos х+(√3)/2=0 cosx=-√3/2 arcos x = arcos (-√3/2) x= 5π/6