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참고 : microsoft , Mathematic Evaluator ( by griffpatch ) 로딩출처 https://www.google.com/search?q=microsoft+loading+gif&sxsrf=ALiCzsaAz2UvK1icMTvsdXyZOB_6-fi_bw:1669989853691&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjOuIeAjdv7AhVQmVYBHfD4DSEQ_AUoAXoECAEQAw&biw=1536&bih=714&dpr=1.25#imgrc=oF48eVWrhoZOCM
