railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Trigonometry

যদি sec2θ + tan2θ = \(\frac{4}{{5}}\) হয়, তাহলে sec4θ - tan4θ এর মান কত?

1
\(\frac{8}{{7}}\)
2
\(\frac{14}{{5}}\)
3
\(\frac{4}{{5}}\)
4
\(\frac{1}{{2}}\)
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