SOHCOHTOA, pronounced so-coat-oh-ah
Sine=Opposite/Hypotenuse,
Cosine=Adjacent/Hypotenuse,
Tangent = Opposite/Adjacent
Or....
Some Old Hag
Cracks All Her
Teeth On Apples
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The simplest way: Ratio a : b equals ratio c : d if (and only if) a*d = b*c
Practice playing them. Memorize the pattern steps.
The ratio 7 to 3 to 5 cannot be simplified.
Memorize them all.
A good way? The Only Way is to do math problems and work out where and why you have difficulties.