What is the envelope of straight lines given by x cos b + y sin b = a sec b, where b is the parameter?

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answerhappygod
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What is the envelope of straight lines given by x cos b + y sin b = a sec b, where b is the parameter?

Post by answerhappygod »

a) y2 + 4a(a-x) = 0
b) y + 4ax = 0
c) y + 4a(a-x) = 0
d) y2 = 4a(a-x)
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