Ответ:
sin^2a+cos^2a=1
cos^2a=1-sin^2a
cos^2a=1-(3/5)^2=1-9/25=16/25
cosa=
cosa=4/5
tga=sina/cosa
tga=3/5 : 4/5=3/4
2. c^2=a^2+b^2
c^2=82^2+57^2
c^2=9973
c=
c≈ 99,86
sina=b/c
sina=57/99,86≈0,57
Угол a=arcsin0,57=35°
Угол b=90-35=55
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Ответ:
sin^2a+cos^2a=1
cos^2a=1-sin^2a
cos^2a=1-(3/5)^2=1-9/25=16/25
cosa=
cosa=4/5
tga=sina/cosa
tga=3/5 : 4/5=3/4
2. c^2=a^2+b^2
c^2=82^2+57^2
c^2=9973
c=
c≈ 99,86
sina=b/c
sina=57/99,86≈0,57
Угол a=arcsin0,57=35°
Угол b=90-35=55