[tex]\frac{1}{1+tg^{2}\alpha } =1/ \frac{1}{cos^{2} \alpha } = cos^{2} \alpha[/tex]
( [tex]1 + tg^{2} \alpha = \frac{1}{cos^{2} \alpha }[/tex] )
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[tex]\frac{1}{1+tg^{2}\alpha } =1/ \frac{1}{cos^{2} \alpha } = cos^{2} \alpha[/tex]
( [tex]1 + tg^{2} \alpha = \frac{1}{cos^{2} \alpha }[/tex] )