Sinx^2+cosx^2=1
cosx^2=1-144/169
cosx^2=25/169
cosx=5/13
tgx=sinx/cosx=12/13:5/13=12/13*13/5=12/5=2 2/5=2.4
ctgx=cosx/sinx=5/13:12/13=5/13*13/12=5/12
Ответ:cosx=5/13 tgx=12/5=2.4 ctgx=5/12
2)
x∈[-3;5.5]
y∈[-3;5.5]
f(x)>1.5 при x∈(-2;0)∪(4,5;5.5]
f(x)>0 при x∈(-2.5;0.5)∪(4;5.5]
f(x)>0 при x∈[-3;-2.5)∪(0.5;4)
ymin=-3
ymax=5.5
12^1/3=∛12
6^2/3=∛6^2=∛36
∛12*∛36=∛432
0.5^1/3=∛1/2
∛432*∛1/2=∛216=6
Ответ:6