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f(θ)=cos 2 θ  হলে 

fθ dθ = sin 2θ2+c

1-fθ dθ =  -2 cosθ +c

1+fθ dθ =  -2 sin θ +c

নিচের কোনটি সঠিক?

Created: 1 week ago | Updated: 1 week ago
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