Suppose ABCD (in order) is a quadrilateral inscribed in a circle. Which of the following is/are always true?

• A

  $\sec \mathrm{B}=\sec \mathrm{D}$

• B

  $\cot \mathrm{A}+\cot \mathrm{C}=0$

• C

  $\mathrm{cosec}\mathrm{A}=\mathrm{cosec}\mathrm{C}$

• D

  $\tan \mathrm{B}+\tan \mathrm{D}=0$