7tg30° * ctg30° = 7(tg30° *ctg30°)= 7*1=7
1)32cos
2)82cos
3)100sin
4)-18sin
(0.4)^(9-x^2)<=1
(0.4)^(9-x^2)<=(0.4)^0
9-x^2<=0
(x-3)(x+3)>=0
=============-3=========3===========
++++++++++++++------------------+++++++++++
(-бесконечность -3]U[3 + бесконечность)
1.А=n^3; B=n
2.A=5; B=5^3=125
3.A=4x^2; B=6xy; C=9y^2
4.A=16a^2; B=12ab; C=9b^2