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निम्नलिखित रेखायुग्मों के बीच का कोण ज्ञात कीजिए

(i)   x -2/2 = y-1/5 =  s + 3/-3 और x + 2/-1 = y - 4/8 = s - 5/4

(ii)  x/2 = y/2 = s/1 और x - 5/4 = y - 2/1 = s - 3/8

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(i) दी गई रेखाओं के दिक् अनुपात क्रमश: 2, 5, -3 और -1, 8, 4 है।

यदि दी गई रेखाओं के मध्य कोण θ है, तब

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