Medium Math Class 12 Level 5

Which relation is correct for direction cosines l, m, n? (Level 5 practice)

Direction cosines l, m, n के लिए सही relation कौन-सा है? (लेवल 5 अभ्यास)

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Correct Answer

D. l² + m² + n² = 1

Explanation

Step 1: Recall the standard identity of direction cosines. Step 2: For direction cosines of a line, l² + m² + n² = 1. Step 3: Remember: the sum of squares of direction cosines is 1.

Step 1: Direction cosines की standard identity याद करें। Step 2: किसी line के direction cosines के लिए l² + m² + n² = 1 होता है। Step 3: Direction cosines में squares का sum 1 याद रखें।

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