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=(sin^2a + (1 + cosa)^2) / (sina(1 + cosA))
=(sin^2a + 1 + 2cosa + cos^2a) / (sina(1 + cosa))
=((sin^2a + cos^2a) + 1 + 2cosa) / (sina(1 + cosa))
=(1 + 1 + 2cosa) / (sina(1 + cosa))
=(2 + 2cosa] / (sina(1 + cosa))
=(2(1 + cosa)) / (sinA(1 + cosa))
=2 / sina
=2 (1/sina)
=2csca