Question

1-sin^2a+ctg^2a*sin^2a
Срочно

Answer 1

Ответ:

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Answer 2

$1-{sin}^{2}a+{ctg}^{2}a \: {sin}^{2}a = \\ = 1 - { sin}^{2} a + {cos}^{2} a = \\ = {cos}^{2} a + {cos}^{2} a = \\ = 2{cos}^{2} a$