KeerthanaPosted on यदि secθ + tanθ = 2 तो sec T का मूल्य है ;fn secT + tanT = 2 a45\frac{4}{5}54 b5 c54\frac{5}{4}45 d2\sqrt{2}2 Answer : Option CExplanation : secθ+tanθ=2……\sec \theta+\tan \theta=2 \quad \ldots \ldotssecθ+tanθ=2…… (i) ∴sec2θ−tan2θ=1\therefore \sec ^{2} \theta-\tan ^{2} \theta=1∴sec2θ−tan2θ=1 ⇒(secθ+tanθ)(secθ−tanθ)=1\Rightarrow(\sec \theta+\tan \theta)(\sec \theta-\tan \theta)=1⇒(secθ+tanθ)(secθ−tanθ)=1 ⇒secθ−tanθ=12\Rightarrow \sec \theta-\tan \theta=\frac{1}{2}⇒secθ−tanθ=21 समीकरणों (i) और (ii) को जोड़कर, ∴secθ+tanθ+secθ−tanθ=2+12=52\therefore \quad \sec \theta+\tan \theta+\sec \theta-\tan \theta=2+\frac{1}{2}=\frac{5}{2}∴secθ+tanθ+secθ−tanθ=2+21=25 ⇒2secθ=52⇒secθ=54\Rightarrow 2 \sec \theta=\frac{5}{2} \Rightarrow \sec \theta=\frac{5}{4}⇒2secθ=25⇒secθ=45 Rate This:NaN / 5 - 1 votesAdd comment