1.a)) Sin (-30)-2tg(-45)-
cos(60)
- sin π/6+2 tg π/4- cos π/3
-1/2+2-1/2=1
b))-2 tg π/3(-ctg π/6)- sin π-5 sin^2(π/3)
-2√3(-√3)-0-5(√3/2)=6-5√3
2)15=15π/180=π/12 30=30π/180=π/648=48π/180=4π/15 75=75π/180=15π/36
4)a)) -Cos^2t-sin^2t=-Cos^2t-(1-Cos^2t)=-1
b)) -sint(-sint)+
cost(cost)= (sin^2t+Cos^2t)=1
5)
a)) 3tg(360-225)-2sin(360-210)+
tg(360-60)-2sin(360-120)=
-3tg(5π/4)+2sin(7π/4)-tg(π/3)+2sin(2π/3)=
-9/2-√3
b)) 4cos(5π4)-6cos(4π/3)-3ctg(π/3)-tg(2π/3)=
-4√2/2+3-3√3/3-√3=
3-2√2-2√3.
№3 я не пойму как делать