Beta, I got lost after SOHCAHTOA myself! But I remember this: you measure what you have first. Two sides and one angle? Try cosine rule. Angles and a side facing one? That's sine rule's job. Sin, cos, tan are just fixed names for those side-divisions, like my dabba for threads and my dabba for buttons.
My own proof is sitting with my nephew's maths copy, a cup of chai, and finally calling my chacha who said, "Start with what is plainly given, beta. The rest follows.
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