\(\frac{3}{2}\left( {\frac{{\cos 39}}{{\sin 51}}} \right) - \sqrt {({{\sin }^2}39 + {{\sin }^2}51})\) નું મૂલ્ય શું છે?

1
1/2
2
5/2
3
0
4
1/2 અથવા 5/2

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