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| 1. |
`cos^(4)theta-sin^(4)theta` का मान होगा -A. `1+2sin^(2).(theta)/(2)`B. `2cos^(2)theta-1`C. `1-2sin^(2).(theta)/(2)`D. `1+2cos^(2)theta` |
| Answer» Correct Answer - b | |