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

If cos θ - sin θ = 0, then (sin8 θ + cos8 θ) is:

1
\(\frac{1}{8}\)
2
\(\frac{1}{4}\)
3
\(\frac{1}{6}\)
4
\(\frac{1}{2}\)
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