A

\(A=4\left[\left(sin^2a+cos^2a\right)^3-3sin^2a.cos^2a\left(sin^2a+cos^2a\right)\right]-6\left[\left(sin^2a+cos^2a\right)^2-2sin^2a.cos^2a\right]\)

\(=4\left(1-3sin^2a.cos^2a\right)-6\left(1-2sin^2a.cos^2a\right)\)

\(=4-12sin^2a.cos^2a-6+12sin^2a.cos^2a\)

\(=-2\)

Phương trình trạng thái khí lí tưởng:

\(\dfrac{p_1\cdot V_1}{T_1}=\dfrac{p_2\cdot V_2}{T_2}\)

\(\Rightarrow\dfrac{4\cdot6}{293}=\dfrac{p_2\cdot4}{313}\)

\(\Rightarrow p_2=6,41atm\)

Chọn A

D

Chọn D

THAM KHẢO:

v chọn B