Ответ №1
1) sin^2 a (1 + ctg a) + cos^2 a (1 - tg a) + 7 =
=sin^2 a + sin a * cos a + cos^2 a - sin a * cosa + 7=
=(sin^2 a + cos^2 a) + 7= 1 + 7 = 8.
Ответ №1
1) sin^2 a (1 + ctg a) + cos^2 a (1 - tg a) + 7 =
=sin^2 a + sin a * cos a + cos^2 a - sin a * cosa + 7=
=(sin^2 a + cos^2 a) + 7= 1 + 7 = 8.
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