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Class 10 Book Solution from Amitava Mitra in Trigonometric Ratios and Trigonometric Identities Question No: 25.1B(30)

\(cos\ x+cos\ y=2\ (0^o\leq x\leq 90^o,\ 0^o\leq y\leq 90^o)\) হলে, (i) sin x + sin y (ii) cos (x + y)-এর মান নির্ণয় করো ।

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