First use a analogy
SOH CAH TOA
Or remember Some Old Hippie Caught Another Hippie Tripping On Asphalt
SOH - Opposite/Hypotenuse
CAH- Adjacent (next to)/Hypotenuse
TOA - Opposite/Adjacent (next to)
Sin(A) - opposite (25)/Hypotenuse (32)
25/32 = 0.78125 or 25/32 (already in simplest form)
Cos - Adjacent(12)/Hypotenuse(32)
12/32= 0.375 or 3/8