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নিচের তথ্যগুলো লক্ষ্য কর:(i) 2sinAsinB= cos(A - B) + cos(A + B)(ii) cos C - cos D = 2sinc + D2 sinD - C2(iii) cos 70∘ - cos 10∘ + sin 40∘ = 0নিচের কোনটি সঠিক?

নিচের তথ্যগুলো লক্ষ্য কর:(i) 2sinAsinB= cos(A - B) + cos(A + B)(ii) cos C - cos D = 2sinc + D2 sinD - C2(iii) cos 70∘ - cos 10∘ + sin 40∘ = 0নিচের কোনটি সঠিক? সঠিক উত্তর ii ও iii

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