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Class 11 Book Solution from S N Dey in Trigonometric Functions and standard Angles Question No: 4.4(x)

\({{xcos\theta}\over {a}} + {{ysin\theta}\over {b}}= 1\) এবং \({{ax}\over {cos\theta}} - {{by}\over {sin\theta}}= a^2 - b^2\) হলে দেখাও যে, \({x^2\over a^2} + {y^2 \over b^2} = 1\) |

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