A point mass oscillates along the x-axis according to the law $\mathrm{x}={\mathrm{x}}_0\cos \left(\mathrm{\omega t}-\frac{\mathrm{\pi }}{4}\right)$. If the acceleration of the particle is written as $\mathrm{a}=\mathrm{A} \cos \left(\mathrm{\omega t}+\mathrm{\delta }\right),$then :

• A

  $\mathrm{A}={\mathrm{x}}_{\mathrm{o}}{\mathrm{\omega }}^2,\mathrm{\delta }=\frac{3\mathrm{\pi }}{4}$

• B

  $\mathrm{A}={\mathrm{x}}_{\mathrm{o}},\mathrm{\delta }=-\frac{\mathrm{\pi }}{4}$

• C

  $\mathrm{A}={\mathrm{x}}_{\mathrm{o}}{\mathrm{\omega }}^2,\mathrm{\delta }=\frac{\mathrm{\pi }}{4}$

• D

  $\mathrm{A}={\mathrm{x}}_{\mathrm{o}}{\mathrm{\omega }}^2,\mathrm{\delta }=-\frac{\mathrm{\pi }}{4}$