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Question : 57 of 120
Marks:
+1,
-0
Solution:
‌=‌=‌Direction ratios are proportional to
1,−2,1 ‌=‌=‌Direction ratios are proportional to
1,‌,2cos‌θ‌‌=‌| a1a2+b1b2+c1c2 |
| √a12+b12+c12√a22+b22+c22 |
‌‌=‌| (1)(1)+(−2)()+(1)(2) |
| √12+(−2)2−12√12+(‌)2+(2)2 |
⇒‌‌θ‌‌=‌.
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