Teaching Railway Teacher PRT 2025 Mock Test Series Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

यदि cos4 θ - sin4 θ = k है, तो (1 - k)/(1 + k) का मान ज्ञात कीजिए। 

1
tan²θ
2
sin²θ
3
cot²θ
4
cosec²θ
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