Class 12 Book Solution from S N Dey in Differentiation Question No: 10A.(4)(20)(a)

অন্তরকলন পদ্ধতি প্রয়োগ করে \(sin (x + \alpha)\) এর সূত্র থেকে \(cos (x + \alpha)\) এর সূত্র নির্ণয় করো ।

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