Biểu thức \(\left( {4 - {x^2}} \right)\left( {{x^2} + 2x - 3} \right)\left( {{x^2} + 5x + 9} \right)\) âm khi

$\sin {225^0} = \dfrac{{ - \sqrt 2 }}{2}$

${\rm{cos22}}{{\rm{5}}^0} =  - \dfrac{{\sqrt 2 }}{2}$

$\tan {225^0} =  - 1$

$\cot {225^0} = 1$

\( - 3{x^2} + x - 1 \ge 0.\)

\( - 3{x^2} + x - 1 > 0.\)

\( - 3{x^2} + x - 1 < 0.\)

\(3{x^2} + x - 1 \le 0.\)

$\left( {3; + \,\infty } \right).$

\(\left( { - \,\infty ;3} \right).\)

\(\left( { - \,3;3} \right).\)

\(\mathbb{R}.\)

Chỉ \(\left( {\rm{I}} \right)\) và \(\left( {{\rm{II}}} \right)\).

Chỉ \(\left( {\rm{I}} \right)\), \(\left( {{\rm{II}}} \right)\) và \(\left( {{\rm{III}}} \right)\).

Chỉ \(\left( {{\rm{II}}} \right)\), \(\left( {{\rm{III}}} \right)\) và \(\left( {{\rm{IV}}} \right)\).

Chỉ \(\left( {\rm{I}} \right)\), \(\left( {{\rm{II}}} \right)\) và \(\left( {{\rm{IV}}} \right)\).

\(\left( {{d_1}} \right):3x + 2y = 0\)

\(\left( {{d_2}} \right):3x - 2y = 0\)

\(\left( {{d_3}} \right): - 3x + 2y - 7 = 0.\)

\(\left( {{d_4}} \right):6x - 4y - 14 = 0.\)

\(1{\rm{ rad }} = {1^0}.\)

\(1{\rm{ rad }} = {60^0}.\)

\(1{\rm{ rad }} = {180^0}.\)

\(1{\rm{ rad }} = {\left( {\dfrac{{180}}{\pi }} \right)^0}.\)

\(\pi {\rm{ rad }} = {1^0}.\)

\(\pi {\rm{ rad }} = {60^0}.\)

\(\pi {\rm{ rad }} = {180^0}.\)

\(\pi {\rm{ rad }} = {\left( {\dfrac{{180}}{\pi }} \right)^0}.\)