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(a ) मूलबिंदु से जाने वाली तथा अक्षो से बराबर कोण बनाने वाली रेखाओ का समीकरण ज्ञात कीजिए ।

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मूलबिंदु से जाने वाली रेखा `AB ` जो x -अक्ष से `45 ^(@)` का कोण बनाती है , का समीकरण
`t=tan 45^(@)xx x` या`y=x` या `x-y=0`
image
तथा दूसरी रेखा PQ जो मूलबिंदु से जाती है x -अक्ष से `135 ^(@)` का कोण बनाती है , का समीकरण
`y=tan 135^(@)xx x`
`y=-x`
या `x+y=0`
अंत: अभीष्ट रेखा के समीकरण `x-y=0` तथा `x+y=0` है

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