railway RRB JE (CBT I + CBT II) Mock Test 2024 Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
যদি \(\frac{sin\, \theta-cos\, \theta}{sin\, \theta+cos\, \theta}=\frac{4}{5}\) হয়, তাহলে \(\frac{cosec^2\theta}{2-cosec^2\theta}\)এর মান কত:
1
\(\frac{16}{25}\)
2
\(\frac{40}{41}\)
3
\(\frac{41}{40}\)
4
\(\frac{31}{30}\)