\(sin\alpha+sin^2\alpha=1\) হলে \( cos^2\alpha+cos^4\alpha\) এর মান কত?
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\(sin\alpha+sin^2\alpha=1\)
বা, \(sin\alpha=1-sin^2\alpha\)
বা, \(sin\alpha=cos^2\alpha\)
বা, \(cos^2\alpha=sin\alpha\)

\( cos^2\alpha+cos^4\alpha\)
\(=cos^2\alpha+(cos^2\alpha)^2\)
\(=cos^2\alpha+(sin\alpha)^2\) [\(cos^2\alpha=sin\alpha\) বসিয়ে পাই]
\(=cos^2\alpha+sin^2\alpha\)
\(=1\)


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