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2009-12-04T20:46:24+01:00
Tg α = 20/21
tg α = y/x, zatem y = 20, x = 21
r² =x² + y² = 21² + 20² = 441 + 400 = 841
r =√841 = 29
cos α =x/r = 21/29
[ tg α + cos α]/ [tg α - cos α] =[20/21 +21/29]/[20/21 -21/29] =
= [580/609 + 441/609]/[580/609 - 441/609] =
= [1021/609]/[139/609] = [1021/609]*[609/139] = 1021/139≈7,35
/ - kreska ułamkowa
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