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sadly i haven’t learned this so i can’t help you with the answers themselves but a graphing utility you could use is a graphing calculator or a graphing calculator online i know one called desmos.com just not sure if it has the intersect feature so i recommend graphing calculator
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I believe it is an acute angle
The answer is A. Hope this helps
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They are not equivalent, try adding in numerical values for x, both do not come out the same.