If l1, m1, n1 ; l2, m2, n2 ; l3, m3, n3 are the direction cosines of three mutually perpendicular lines, prove that the line whose direction cosines are proportional to l1 l2 l3, m1 m2 m3, - Mathematics | Shaalaa.com

Saaniya Mehra on Instagram: "Never give in ❤️‍🩹 On the 9th of July 2025, I injured my back while squatting 70kgs. Not because the weight was too heavy for me—but because a stranger decided to step in and spot me when I never asked for it. The second I saw him approaching in the mirror, I opened my mouth to say “no.” That split-second distraction made me lose my core pressure. My back gave out. Four discs herniated—L1-L2, L2-L3, L3-L4, L4-L5. For the first month, I couldn’t even walk. I spent th

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