항등식
뜻풀이
식에 포함된 문자에 어떤 값을 넣어도 언제나 성립하는 등식. ‘<img style="vertical-align: middle;" src='data:image/png;base64,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' />’, ‘<img style="vertical-align: middle;" src='data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKMAAAAfCAIAAAAEBurZAAADdklEQVR42u1ZQUsqURQWwh8gRMjDrUTrNuLChbR1IRK0kJB4BPFwISKBhAu3Ei2iXYSISAQSIRISiLhwIYKISEQI0SJCJAiRiIj3Pt7AMFzHmTszVxE732qcZs79zvnOPefcyfaX8DNgoxCQ0gRSmkBKE0hpAin9w/D+/n5zc3N/fz9ny6T0XPHy8lIsFr+/v2Ox2Onp6Twtayn9+vo6H/+/vr5Go9HCchCIXC6XSCRwgbWcTuc8LU9V+uHhAS/PwttOp4Psa7VaypsnJydvb28LyEEsYP/x8REXqLEej0egC7qW1ZX+/PyMRqMz8rbX6/l8vkKhwKyIsrNoHGaH/f39drst3AUNy+pKZzKZZrNpjsHd3d3Hx4f2MxsbG09PT8zNi4uLSqUihAMPeDjMCJBHiGuTLmhYVlfa7/ebXv78/Fy74aH1ulwu1U4ZCASEcNAFJ4dZoF6voytJF2Jd0LasojT2fiQSYW4Oh8NsNnt1ddXv97vdrhWlLy8vd3Z2rq+v8aTETMbW1hamR+scdMHDwTomCWPDra2t/foPEBDogq5lm2ptYcZ0TPDYYdK0EgqFtNunrtJ7e3swgqaIa7fbrQxrOBxuNBrWOeiChwOz15PJ5J8pQNBVjz0CCRtygbd6YwRlqKPzIzGl6+3tbeSRFaXX19elKRFwOBzKsGKaKJVK1jnogofD5JQ6DciDyefFEjbkAq/Sh4eHyiijLNjtdjllVldXx+Mxk+9IWDnBkcgIlvwTwjMFDUVGfnFlZUU5UxwcHEgRMcpBOlBO23NMqefkYAU8hFXPxEJc4FUa82c+n1cWc3k4whluc3NTWsncnr69vUWCS9cIKKZHpiLhAesctMHJgdnQv6fj7OxssgMKJGzUBV6l8ebR0ZH8s1wuy0ZTqRQCIX1fNac0kn13d1eerqvVqvKvwWBwMBhY56C74Xg4WIFYwkZd4FUanOCt8g5mOdhCbcFWA2k0UY3+r9unUYtgLZ1Oy21MhtfrFcJBFzwcLEIsYUMuGDhPI8rM1w9UHokohknVAYRfaaU15vMe0l8IB84jkC4HUUsIIczpgjGlcZw9Pj42t7zp0hePx5Wfna1wMA2GwzJh6n84EOXn5+e58ajVapMT7yJwWH6lAeX0O1OgBKkeYReEw/IrTSClCaQ0gZQmkNIEUppAShOM4h8Jz76La6VydwAAAABJRU5ErkJggg==' />’ 따위가 있다.