Wb Jee
Inverse Trigonometric Functions
WB JEE 2025
MCQ+1 / -0.252025
যদি $\cos ^{-1} \alpha+\cos ^{-1} \beta+\cos ^{-1} \gamma=3 \pi$ হয়, তাহলে $\alpha(\beta+\gamma)+\beta(\gamma+\alpha)+\gamma(\alpha+\beta)$ এর মান হল
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