Teaching HTET PGT Level 3 - 2024 Mock Test Mathematics Trigonometry

sin\(\left(\frac{\pi}{15}\right)\) - 2sin\(\left(\frac{2\pi}{5}\right)\) का मान ज्ञात कीजिए।

1
√3 cos 12∘
2
-√3 cos 12∘
3
3 cos 42∘
4
- 3 cos 42∘
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