wykorzystujac zwiazki miedzy funkcjami trygonometrycznymi tego samego kata zapisz w prostszej postaci wyrazenie
c . cos do 2potegi 13 + cos do 2 potegi 77
d .tg 25 razy tg 45 razy tg 65
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c)
cos ^ 2 (13 st) + cos ^ 2 (77 st ) = cos ^2 ( 13 st) + sin^2 (13 st) = 1
bo cos 77st = cos ( 90 - 13) st = sin 13 st
d)
tg 25 st * tg 45 st * tg 65 st = tg 25 st * 1 * ctg 25 st = tg 25 st * ctg 25 st = 1
bo tg 65 st = tg ( 90 - 25) st = ctg 25 st