pomocy daje naj zadanie z matmy w załączniku pilne

1. [latex]tg alpha = frac{sin alpha }{cos alpha } \ frac{2}{5} cos alpha =sin alpha \ sin^2 alpha +cos^2 alpha =1 \ frac{4}{25} cos^2 alpha +cos^2 alpha =1 \ cos^2 alpha = frac{25}{29} \ cos alpha = frac{5}{ sqrt{29} } ,sin alpha = frac{2}{ sqrt{29}} [/latex] [latex]ctg alpha = frac{1}{tg alpha } = frac{5}{2} [/latex] 2. [latex]L=cos alpha ( frac{sin alpha +1-(sin alpha -1)}{(sin alpha +1)(sin alpha -1)} )=cos alpha ( frac{2}{sin^2-1} )=cos alpha ( frac{2}{-cos^2 alpha } )=- frac{2}{cos alpha }=P [/latex]