Question

1/1+sin альфа-1/1-sin альфа
Ппоолжжаалууййсттаа

Answer 1

$\frac{1}{1+sin \alpha } -\frac{1}{1-sin \alpha } = \\ = \frac{(1-sin \alpha -1-sin \alpha )}{(1+sin \alpha )(1-sin \alpha )} = \\ = \frac{-2sin \alpha }{1- sin^{2} \alpha } = \frac{-2sin \alpha }{cos^{2} \alpha }= -2*\frac{sin \alpha }{cos^{2} \alpha }$