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cot(90-A) which in this case to keep it simple A=x
Most of these types of things are rules and you must memorize I struggled with the same thing. You can also graph both of them to see that they overlap since cot is 1/tanx by have tan(90-x)=cotx and cot(90-x)=tanx
Please let me know if you need any clarification. I'm always happy to answer your questions.
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