Teaching Railway Teacher PRT 2025 Mock Test Series Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
\(\text{जर } \cos^4 \theta - \sin^4 \theta = k, \text{ तर } \frac{1-k}{1+k} \) चे मूल्य काय आहे?
1
tan²θ
2
sin²θ
3
cot²θ
4
cosec²θ