a,b,c are the acute angles:
x = (sec a + tan a)(sec b + tab b)(sec c + tan c) and y = (sec a - tan a)(sec b - tab b)(sec c - tan c), prove that x = y ,and x =y=1
x = (sec a + tan a)(sec b + tab b)(sec c + tan c) and y = (sec a - tan a)(sec b - tab b)(sec c - tan c), prove that x = y ,and x =y=1
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