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ত্রিকোণমিতিক ফাংশনের ক্ষেত্রে –

i.  cos 4A = 1-tan22A1+tan22A 

ii. sin 6A = 2sin 3A cos 3A

iii. tan8α = 2 tan 4α1 - tan 4α  

নিচের কোনটি সঠিক?

Created: 1 month ago | Updated: 1 month ago

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