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Упростите:
1) cos^2 a + tg^2 a+ sin^2 a
2) sin^2 a + cos^2 a + 1
Упростите:
1) cos^2 a + tg^2 a+ sin^2 a
2) sin^2 a + cos^2 a + 1
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Answers & Comments
Ответ:
1) 1/cos² a.
2) 2.
Объяснение:
1) cos^2 a + tg^2 a+ sin^2 a = (cos^2 a + sin^2 a) + tg^2 a = 1 + tg^2 a = 1/cos² a.
2) sin^2 a + cos^2 a + 1 = (sin^2 a + cos^2 a) + 1 = 1 + 1 = 2.