Good question!
First of all, you need to be aware of the following trigonometrical ratios\functions:
For angle A:
adjacent=12
opposite=35
hypotenuse=37
Hence:
[tex]cos(A)= \frac{12}{37}
\\~\\
sin(A)= \frac{35}{37}
\\~\\
tan(A)= \frac{35}{12} [/tex]
I hope that
helps!
I am with you if you faced any difficulties!