if "a" vector cross "b" vector is equal to "c" vector cross "d" vector and "a" vector cross "c" vector is equal to "b" vector cross "d" vector then show that "a" vector minus "d" vector is parallel to "b" vector minus "c" vector???
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https://www.meritnation.com/ask-answer/question/if-a-x-b-c-x-d-a-x-c-b-x-d-show-that-a-d-is-parallel/vector-algebra/7763077