2 - \(\frac{{{{\sin }^2}a}}{{1 - \cos a}}\) + \(\frac{{1 - \cos a}}{{\sin a}}\) - \(\frac{{\sin a}}{{1 + \cos a}}\) విలువ కనుగొనండి?

1
1 - sinα 
2
1 + sinα
3
1 + cosα
4
1 - cosα

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