24. साबित करें कि बिनदु (0, 7, 10), (-1, 6, 6) तथा (-4, 9, 6) समद्विबाहु समकोण त्रिभुज बनाते हैं ।(Show that the points (0, 7, 10), (-1, 6, 6) and (-4, 9, 6) from a right angled isosceles triang!25. श्रेणी के n पदों का योगफल निकालें (Find the surn to n terms of the series.)13 + (1 + 23) + (12 + 22 + 33) + ......... पदों तक (terms)26. निम्नलिखित आँकड़ों का माध्य विचलन ज्ञात करें । (Find the mean deviation of the following dataप्राप्तांक (Marks obtained) | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60बारंबारता (Frequency) । 4 । 7 । 15 । 12 । 7 । 527. प्रथम सिद्धांत से (find the derivative of cosx form first principle) अवकलन ज्ञात करें ।28. यदि (if y = Inxcox तो (then) = ?29. आंकड़ों के लिए माध्य के सापेक्ष विचलन ज्ञात करे । (Find the mean deviation about the mean f38, 70, 48, 40, 42, 55, 63,

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