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दिखाइए की बिंदु `A(2,-3-4),B(1,2,3),C(3,-8,-11)` |
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Answer» Correct Answer - (i) ` cos ^(-1)(( 20) /( 21 )) ` (ii) ` 60 ^(@) ` (iii) ` 90 ^(@) ` |
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