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যদি ( f(x)= sin 2 x ) হয় তবে- i. ( lim _ x rightarrow 0 f(x) 2 x =1 ) ii. ( f^ prime (x)=2 cos 2 x ) iii. ( f(x) d x= cos 2 x+c ) নিচের কোনটি সঠিক? | Suva Ai