Respuesta :
Answer: Option 'a' is correct.
Step-by-step explanation:
Since we have given that
[tex]\cos 90^\circ=0[/tex]
As we know that
Sine function and Cosine function are complementary.
So, it becomes ,
[tex]\cos(90^\circ-90^\circ)=0\\\\\implies \sin 0^\circ=0[/tex]
Hence, Option 'a' is correct i.e. a. 0, because the angles are complementary.