Question

Please explain? Study Island trigonometry

Answer 1

How do I find this?

Answer 2

do you know the formula for sin (A+B)
?

Answer 3

sin (A-B)
?

Answer 4

No

Answer 5

sin (A-B) = sin A cosB - cos A sin B
here
put A=90
B=alpha

Answer 6

conssider this right angle .... try to find a relation between a & b such that b=90-a.

Answer 7

I'm sorry, I'm so lost :3

Answer 8

Would the answer be cos(a) ?

Answer 9

sry i didnt note that i interupt @hartnn ... r u lost wid my conclusion or his ?? coz if u lost in mine i'll teach it to u .

Answer 10

I was confused at what you meant @ikram002p

Answer 11

she was trying to find same thing using triangles!

Answer 12

Ohh I see, nevermind @ikram002p Thank you both!

Answer 13

sin (b)=sin(90-a)=f/r
cos(a)=f/r
so u was write the answer is D.