cosx = √1−sin2x1 - sin^2 x1−sin2x cosx = √1−(−3/5)21 - (-3/5)^21−(−3/5)2 cosx = √1−9/251 - 9/251−9/25 cosx = √16/2516/2516/25 cosx = 4/5
tgx = sinx / cosxtgx = −3/5-3/5−3/5 / 4/54/54/5 tgx = -3/4
ctgx = 1 / tgxctgx = 1 / −3/4-3/4−3/4 ctgx = -4/3
Таким образом,cosx = 4/5,tgx = -3/4,ctgx = -4/3.
cosx = √1−sin2x1 - sin^2 x1−sin2x cosx = √1−(−3/5)21 - (-3/5)^21−(−3/5)2 cosx = √1−9/251 - 9/251−9/25 cosx = √16/2516/2516/25 cosx = 4/5
tgx = sinx / cosx
tgx = −3/5-3/5−3/5 / 4/54/54/5 tgx = -3/4
ctgx = 1 / tgx
ctgx = 1 / −3/4-3/4−3/4 ctgx = -4/3
Таким образом,
cosx = 4/5,
tgx = -3/4,
ctgx = -4/3.