(secθ+tanθ)=7/5 হলে (secθ-tanθ) এর মান কত ?
Solution
Correct Answer: Option A
দেয়া আছে, secθ+tanθ=7/5
আমরা জানি , sec²θ-tan²θ=1
বা,(secθ+tanθ)(secθ-tanθ)=1
বা,7/5(secθ-tanθ)=1
অতএব,secθ-tanθ=5/7
আমরা জানি , sec²θ-tan²θ=1
বা,(secθ+tanθ)(secθ-tanθ)=1
বা,7/5(secθ-tanθ)=1
অতএব,secθ-tanθ=5/7
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