নিচের কোনটি সঠিক?

A sec2θ= 1+tan2θ

B sec2θ= 1 - tan2θ

C tanθ= cosθ/sinθ

D sin2θ - cos2θ = 1

Solution

Correct Answer: Option A

আমরা জানি,
sec2θ - tan2θ= 1

so, sec2θ = 1 + tan2θ

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