Try not to store in the memory something which is derivable.
I always try that. Trigonometric ratios of standard angle is one among them. It
is very simple if you understand. Let me assume that you’re starting from the
scratch.
sin θ = Opposite / Hypotenuse
cos θ = Adjacent / Hypotenuse
tan θ = Opposite / Adjacent
cosec θ = 1 / sin θ = Hypotenuse / Opposite
sec θ = 1 / cos θ = Hypotenuse / Adjacent
cot θ = 1 / tan θ = Adjacent / Opposite 
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