Ответ:
a) cos 130 = cos(180-50)=-cos 50
б) sin 145 = sin (180-35)= sin 35
в) tg 87 = tg (180-93)= -tg 93
г) cos 95= cos (180-85)= -cos 85
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Ответ:
a) cos 130 = cos(180-50)=-cos 50
б) sin 145 = sin (180-35)= sin 35
в) tg 87 = tg (180-93)= -tg 93
г) cos 95= cos (180-85)= -cos 85