If you can do all of them do, but i mainly need 11-13.

11. D. All of these

12.

sin30° =

cos 45°=

cos 30°=

tan 45°=

tan 30°=

13. B tan 60°

Step-by-step explanation:

11.Given,

ABC is a triangle with sides measures as

We have to find the different trigonometric ratio,

We know,

We observe,

Therefore both are equal, option (A) is correct!

It is a rule that,

Thus option (B) is correct!

It is a universal proof that ,

Thus option (C) is true!

Therefore option (D) is the appropriate choice 'all of these' are correct!

12.

We know,

We know ,

Similarly,

We know,

Similarly,

13.

We know,

Therefore B is the correct option!